'This book is designed to explain, illustrate, and describe the development history of the patriotic movement of the Buddhist Sangha of Vietnam in Ho Chi Minh City and Nam Bo in particular, the Buddhist Sangha of Vietnam in general. Vietnamese Buddhism always accompanies the nation in the process of building and protecting the country and international integration. The main content of the book consists of 3 parts: 1. Origin, philosophy, sect and path of Theravada Buddhism introduced into Vietnam. 2. Phap Hoa Pagoda and patriotic Buddhist movement in Saigon - Gia Dinh during the period of anti-French colonialism and American imperialism (1928-1975). 3. Contribution of Phap Hoa pagoda and monk Thich Nhu Niem with the career of "Social service religion", "Accompanying with the Nation" (1975-2018).