Negative Impacts of Free Migration in the Mountainous Provinces of Northern Vietnam

There are three provinces selected as survey sites, including Cao Bang, Ha Giang, and Son La. Reason for selection: they are a border province where many ethnic minorities migrate freely. In these provinces, there are intra-regional migration, cross-border migration, and migration to the Central and Central Highlands with complex characteristics (Office, 2016). Survey 300 persons in three selected by random sampling method. Survey method: Ask for opinions by questionnaire. Survey subjects according to households, managers, and experts with a sample structure of 300 votes. It divides into specific: 150 votes for managers and experts and 150 votes for households.