Since the late 19th Century, research works on languages of ethnic groups in Vietnam have aimed at different targets, of which one is to study culture expressed in language. This is a common research goal in various fields, such as: linguistics, anthropology, Eastern studies, Vietnam studies, ethnography, and cultural studies etc... Research-based cultural research works in Vietnam can be divided into 5 categories, including: Contact linguistics, Ethno - linguistics, Linguistic Demography, Cultural Linguistics, and Applied Linguistics. They are the fundamental premises for formation of some training subjects and disciplines such as: demography linguistics, linguistic demography, language and culture, language-based Vietnamese culture at universities of social sciences and humanities at present.