Ơ Đu ethnic people in Nghệ An province trying to preserve their mother tongue 11/07/2016 (VOVworld) – The Ơ Đu are one of the five smallest ethnic minorities in Vietnam. Most of the 400 surviving Ơ Đu live in Văng Môn hamlet, Tương Dương district, Nghệ An province. Ơ...