So it would seem you would get a +10 dodge bonus (at level 20) that stacks with other dodge (such as dodge feat) bonuses (but not additional bonuses from Offensive Defense) so that at you can only gain the bonus against one creature from one sneak attack. You could however sneak atatck multiple creatures in a round it seems and get that bonus against all of them.
There is an FAQ specifically for offensive defense that explains a forthcoming errata that fixes this. To answer your question, no. You can not gain a stacking bonus from a single source more than once unless it specifically states that you can such as with hammer the gap.
Bonuses are numerical values that are added to checks and statistical scores. Most bonuses have a type, and as a general rule, bonuses of the same type are not cumulative (do not “stack”)—only the greater bonus granted applies.
The important aspect of bonus types is that two bonuses of the same type don't generally stack. With the exception of dodge bonuses, most circumstance bonuses, and racial bonuses, only the better bonus of a given type works. Bonuses without a type always stack, unless they are from the same source.
I'd also like to note that if you read the FAQ already linked, it states the following: "...bonuses don’t stack from the same source..."
Perhaps it would benefit all of us if you just told us the reason you are asking the question. Is there an item/skill/feat you are specifically looking into? Because if you are just asking a general overall question about stacking bonuses then you didn't need to post the question. The answer is right there in the core rulebook.
Furthermore, an untyped bonus will only stack if they are from different sources.
...And now I'm trying to think of a spell that grants an untyped bonus. Brain freeze.