This branch of the tree

The practice at this temple is an untypical mix of Chinese Zen, or Chan, and Pure Land.

"There is also a unique Vietnamese form of Buddhism which evolved in the southern provinces, and is a successful combination of Theravada and Mahayana. While much of the philosophy is Mahayana, the Sangha (monks and nuns) follow the Vinaya rules (code of ethics) quite strictly, and go on the traditional alms round every day. As for example, the Venerable Minh Dang Quang (see picture below) who was the founder of the Vietamese indigenous Buddhist order."

We are not associated with Cloud Water Zendo but this is a good explanation about this combination practice.
A more scholarly treatment of this fusion of schools is discussed here.