The Bo Y ethnic group, also called Chung Cha, Trong Gia, Tu Di, Tu Din, Phu Na live in Lao Cai, Yen Bai, Ha Giang and Tuyen Quang provinces.
Ancestor worship is the basis of Bo Y religion. The Bo Y live in houses bo ybuilt on the ground. There is always an extra room in this type of house constructed of wooden boards that rest on the main beams of the house. These rooms serve as the bedroom for unmarried boys and as a granary. The wedding ceremony of the Bo Y is a complicated and expensive endeavor. A unique characteristic of this wedding ceremony is that the groom does not attend the ceremony. Instead, he sends his younger sister to the bride’s family to lead a pink horse during the wedding. When the parents die, the children must practice strict mourning rites, 90 days to mourn their mother and 120 days to mourn their father.
Women wear a full skirt, a five-paneled shirt and a bra. Some of the women have adopted the Nung or Han way of dressing.
The Bo Y practice slash-and-burn agriculture. Every year, when the rainy season arrives, the Bo Y go to the rivers to catch spawn and fish to put in their ponds and submerged fields.