Dear Highly Specialized:
Your inquiry is rather unique. You are someone in Bhutan who wants to do a graduate degree that specializes in taxation. We hope you realize that tax philosophy and rules vary, sometimes dramatically, across states within a country, let alone across countries. Your narrow specialization would be useful for employment only in the US.
The
iMahal Education Channel offers a
List of Business Schools in the US. You would be required to take either the GRE (Graduate Record Exam) or GMAT (Graduate Management Aptitude Test) by prospective colleges.
Information on Entrance Exams, such as the GRE and GMAT, is offered in the
iMahal Education Channel.
You may also want to locate websites for organizations that work with communities of accounting graduate programs, such as
The Organization of Accredited Graduate Programs in Accounting.