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You could take such feats for unarmed strikes, as unarmed strikes are part of the "natural" weapons group

No, unarmed strike isn't a natural weapon.

Strike, Unarmed
An unarmed strike is always considered a light weapon. Therefore, you can use the Weapon Finesse feat to apply your Dexterity modifier instead of your Strength modifier to attack rolls with an unarmed strike. Unarmed strikes do not count as natural weapons (see Combat). The damage from an unarmed strike is considered weapon damage for the purposes of effects that give you a bonus on weapon damage rolls.
A monk or any character with the Improved Unarmed Strike feat can deal lethal or nonlethal damage with unarmed strikes, at his discretion.

but touch attacks are not considered unarmed strikes. You could make an unarmed strike while holding a charge, and if you hit normal AC deliver the charge.

Touch Attack Spell is considered “Armed” Unarmed Attack.

This is further specifically reinforced by this FAQ showing that making a touch attack requires a standard action, and thus cannot be used in a full attack. AoO's are not standard actions, and by implication then a touch attack cannot be made as an AoO (just like you cannot cleave or vital strike as an AoO).

You can use Weapon Finesse with Vital Strike, that's what we was talking about.

So holding a charge makes you armed

No, as said in the quote, “Armed” Unarmed Attacks: a spellcaster delivering a touch attack spell.

Delivering a touch attack spell require an Attack Roll, because you have to hit the enemy, and in that attack roll you add your strength, as usual for Melee Attacks.

What do Weapon Finesse? enchant a manufactured weapon? no it doesn't.

You are trained in using your agility in melee combat, as opposed to brute strength.

That's what do, just changes the way you hit, like "Guided".

Unarmed Attacks

Striking for damage with punches, kicks, and head butts is much like attacking with a melee weapon, except for the following:

Attacks of Opportunity: Attacking unarmed provokes an attack of opportunity from the character you attack, provided she is armed. The attack of opportunity comes before your attack. An unarmed attack does not provoke attacks of opportunity from other foes, nor does it provoke an attack of opportunity from an unarmed foe.

An unarmed character can’t take attacks of opportunity.

An unarmed attack, without Improved Unarmed Strike feat, cause Attack of Opportunity, because it's not a weapon, but it's anyway elegible for Weapon Finesse.

Just follow the logic:

Weapon Finesse

You are trained in using your agility in melee combat, as opposed to brute strength.

Work only on light weapons, obviously because you no longer use the strength, and your hand is surely light.

Unarmed Attacks

Striking for damage with punches, kicks, and head butts is much like attacking with a melee weapon, except for the following:

Attacks of Opportunity: Attacking unarmed provokes an attack of opportunity from the character you attack, provided she is armed. The attack of opportunity comes before your attack. An unarmed attack does not provoke attacks of opportunity from other foes, nor does it provoke an attack of opportunity from an unarmed foe.

An unarmed character can’t take attacks of opportunity (but see “Armed” Unarmed Attacks, below).

“Armed” Unarmed Attacks: Sometimes a character’s or creature’s unarmed attack counts as an armed attack. A monk, a character with the Improved Unarmed Strike feat, a spellcaster delivering a touch attack spell, and a creature with natural physical weapons all count as being armed (see natural attacks).

Touch attack spell is treated in the same way as Unarmed Strike and Natural Attacks for this purpose.

Weapon Finesse (Combat)
With a light weapon, you may use your Dexterity modifier instead of your Strength modifier on attack rolls.

Weapon Focus (Combat)
You gain a +1 bonus on all attack rolls you make using the selected weapon.

Arcane Strike (Combat)
As a swift action, you can imbue your weapons with a fraction of your power.

“Armed” Unarmed Attacks: Sometimes a character’s or creature’s unarmed attack counts as an armed attack. A monk, a character with the Improved Unarmed Strike feat, a spellcaster delivering a touch attack spell, and a creature with natural physical weapons all count as being armed (see natural attacks).

A Touch Attack Spell is considered an “Armed” Unarmed Attacks, like a character with the Improved Unarmed Strike feat or a creature with natural physical weapons, in fact it is eligible for Weapon Finesse.

Following this, it should be possible to apply Bonuses, at least for an attack rolls, like those given by an "Amulet of Mighty Fists", weapon special ability like "Guided", Spells like "Divine Power", or pick a feat "Weapon Focus Melee Touch Attack"

What do you think about it?
Is there any FAQ that talks about it?

I'd give it the same attack bonuses as an unarmed strike would get. So yes to most of those, but you'd want Weapon Focus (unarmed strike).

I can't find any FAQs addressing it.

BTW, this is part of the Pathfinder 2nd Edition Playtest forums; you want Rules Questions since this is a 1st Edition question. I've flagged your post to be moved, but they're really, really busy just now, so you should probably re-post there.

Oh im so sorry for the mistake, thanks for the answer, i'll repost it in the right section.

“Armed” Unarmed Attacks: Sometimes a character’s or creature’s unarmed attack counts as an armed attack. A monk, a character with the Improved Unarmed Strike feat, a spellcaster delivering a touch attack spell, and a creature with natural physical weapons all count as being armed (see natural attacks).

A Touch Attack Spell is considered an “Armed” Unarmed Attacks, like a character with the Improved Unarmed Strike feat or a creature with natural physical weapons, in fact it is eligible for Weapon Finesse.

Following this, it should be possible to apply Bonuses, at least for an attack rolls, like those given by an "Amulet of Mighty Fists", weapon special ability like "Guided", Spells like "Divine Power", or pick a feat "Weapon Focus Melee Touch Attack"

What do you think about it?
Is there any FAQ that talks about it?