Lunar New Year is the traditional, sacred and important New Year of our people, so it should be called Tet. The importance of Tet is deeply rooted in the spirit and emotions of the people are all to see Tet is a sacred time connecting heaven and earth, the realm of the world with the realms, and above all, connect the cord of affection to the family, the family, the friendly friends, the neighbors, the social community. The discussion on the Tet festival explains the origins of Tet traditions in the North, Central and South as well as the practice of writing sentences and puns, the taboos of early years, Apples in the sky, ritual sacrifices on Tet from the Tran dynasty to the Nguyen dynasty ... all are carefully interpreted by the author.