Where can I recruit Thais or Thai students?

It depends on where you are. Kunming, Beijing and Shanghai are all good candidates, especially Beijing. It shouldn't be difficult to contact the universities where Thais often attend. It would be much easier if you were in Beijing. I suggest you go to Beijing or university of international business and economics to recruit people. There are quite a few there, or if you can wait for the Spring Festival abroad, I can ask a friend for you. He is also Thai and graduated from university of international business and economics. He knows many Thai students, but after becoming a monk, he won't return to customs until New Year's Day.