There are companies like Frontier, my daughter went to Vietnam a few years back with them.
She got a BTEC in Tropical Habitat Conservation from her stay. They searched for new species on the islands in the bay of tonkin and in the limestone crags.
However, if other trips are similar, it was not for the faint hearted (or the worrying parent). It was quite tough. Especially if the participants have done no outside/survival living before.
Frontier also ran into some trouble this year for putting in danger some of its participants who got shot at by African rebels. Although Frontier say they have tightened up where they go since.
That said, it is an adventurous and exciting thing to do and I am sure you will enjoy your trip
