The book conducted a preliminary survey on Yai, Tai and Kaolan lifestyles in Lao Kai and Yen Bai Provinces in northern Vietnam. It is found that the Yai and Tai are categorized in the Tai language family but Kaolan is in the Tai-Thai language family. Yai houses are built on the ground while those of Tai and Kaolan are on stilts. The three ethnic groups are farmers growing rice, corn, sugar cane and cassava roots. After marriage, women move in to live with men’s families and belong to the spirits of their husbands’. They are animistic and conduct appeasement rituals during festivals all year round. The Yai have “Ya Jim” as a medium and healer and “Mor” or “Tao” is in charge of contacting spirits in the netherworld. Tai have “Mod” as a healer and “Mor” as a conductor of rituals. Kaolan have “Ong Sai” as a healer and “Sai Fu” as a funeral conductor sending the deceased to heaven. Nowadays, rituals have been conducted less and less. However, lost rituals have been revitalized to promote the tourism businesses of Vietnam.