This book contains materials and a series of photos that illustrate Rituals "Len đong" scenes taking place in an environment where many women participate. Different from some countries but it is a direct reflection of what we know about the role of women in ancient Vietnamese society. This divine worship is incorporated into the Đao Mau (Mother Goddess religion), or rather, the incarnations of the Mau such as Mau Thoai, Mau Thuong Thien, Mau Thuong Ngan... The content of the book is really important in the time that the author observes, in the 50s of the 20th century. It is a social aspect of religion with one side being activities organized privately by wealthy women in a quite upstream atmosphere; on the other side are ordinary people's gatherings in normal temples, like the Ghenh temple in Hanoi, on the banks of the Red River.