There are many the ethnic minority in Vietnam. They live through out the country. The exciting place i have been and want to introduce to you is Buon Don village in Dak Lak province where you can approach the original custom and traditional life.
The mainly ethnic minority here are E De, M'nong, Gia Rai.. Go there, you can visit the ancient House on stilts, the statue in the funeral house, enjoy with riding elephant and mess wooden suspension bridge. Also many interesting things to see. you will forever be attached to the land, man and nature here.