Hi Sea,
I know Vietnam can be quite difficult to transition in and to get medical help. It may be a case of trying to get to a more TG accepting country. I have no idea of how difficult that may be but I do know it can depend upon your job prospects and qualifications.
Thailand may be your closest Asian country where ready acceptance is available. China, in particular Shanghai, has good facilities for medical transition at least for MtF, not sure about FtM though. Hong Kong is another alternative. If you can get to Australia or New Zealand and gain permanent residency you would be covered by the health insurance but not as a visitor or on a temporary visa.