There is something called WEAMS. It's on the VA website. They show overseas schools that accept the GI Bill. You can also search on the top right section called "GI comparison tool" They show things like how many students are going there, if the school has any complaints, etc. I couldn't find any schools in Thailand that you can use your GI Bill while learning Thai. I also checked different countries for Spanish. So far nothing. If you find anything let me know. Here is the WEAMS section.