Can I use actions of the same card more than one time per turn? For example I can use the Shub-Niggurath habiliti 3 times in the same turn (Action: Pay 3 to search your deck for a Dark Young character and put that character into play. Then shuffle your deck), if I have suficient domains to pay for action? In the same way, I can use actions our disrupts on cards more than one time per turn (exemple: Y’Golonac, Shotgun and Arkham Asylum)?

You can use pretty much any effect on any card as long as you can meet whatever play restriction or associated cost. The exception to this is the one response per trigger rule... a card with a response effect can only trigger its effect once per trigger.

Like Penfold says yes. The main thing you'll run into is cards that say something like "Exhaust whatever to do whatever" or "Pay something and exhaust whatever to do whatever" as part of the cost. Those you won't be able to reuse since they're exhausted.

For example... Prize Pistol. You have to pay 1 AND exhaust it to use it, so you can only use it once until it refreshes.

This all falls under what Penfold was saying with the play restriction, but since it's by far the common case, I figured I'd expand upon his answer.

Thanks a lot for the tips!