Well to get the "official" t&c`s of a particular contract you most likely have to talk to the people at the agency.
For the most common contracts I would do a search here using the search function of pprune, at least for the Vietnam and most of the Indian contracts you should finde some info.
By the way, I used to fly a contractor, not anymore thoug, but still receive offers from some agencies as my details are still on file with them. They just forgot to delete me from theirs lists, even if asked to do so. My point is, just register with them and you will see what they will offer you, costs nothing and there is no obligation at all. If t&c details are missing just ask them to be more precise.
