Where should I take my APs?

Last year, I decided to contact an AP Coordinator to locate a nearby AP testing place for me (there are few in Vietnam). He came up with a list of 3 schools, but they either don't allow outsiders to test at their campus or don't offer my subject when purchasing the tests. I tried to reason with them as the Coordinator suggested, for I had the right to do so, and for they have registered to be a "testing center". Gradually I became annoyed by their attitude and decide to try a different path (and no, I have not the intention of quitting taking them). So my question is, can I take my exams in another country? If yes, how can I do so and who should I contact?

Sorry for my lengthy and over-detailed (yet bad English) post. You can read only the last sentence.
Thank you.