Do you have Orkut account go there and find some Nepalis who are studying in Bangkok (There are many) and be very polite and sincere then write a mail or give a call. Im sure there would be someone coming to help your parents.

www.orkut.com
Go to Community = Nepal, I love Nepal, Nepalis aroudn the world etc etc..there are lots of Nepalis....!!

Good luck
By the way, last year I had a very good online Nepali friend in Bangkok but now she is back to Ktm.