Vietnamese Cambodians (Khmer: យួន, Yuon) refer to ethnic Vietnamese living in Cambodia. They mostly reside in southeastern parts Cambodia bordering Vietnam or on boathouses in the Tonlé Sap lake and Mekong rivers. The first Vietnamese came to settle modern-day Cambodia from the early 19th century during the era of the Nguyễn lords, and most of the Vietnamese came to Cambodia during the periods of French colonial administration and the People's Republic of Kampuchea administration. During the Khmer Republic and Khmer Rouge governments in the 1970s, the Vietnamese were targets of mass genocides thousands of Vietnamese were killed and many more sought refuge in Vietnam. Ethnic relations between the Khmers and Vietnamese are poor, and the Vietnamese have been the main target of xenophobic attacks by political parties since the 1990s. Most of the Vietnamese are stateless residents of Cambodia, and as a result they face difficulties in getting access to education, employment and housing.