Question: what are the hoa hao movement?
Answer: Hoa Hao, in full Phat Giao Hoa Hao, Vietnamese Buddhist religious movement that was formed in 1939 by the Buddhist reformer Huynh Phu So. The Hoa Hao, along with the syncretic religious group Cao Dai, was one of the first groups to initiate armed hostilities against the French and later the Japanese colonialists.