Vietnamese Zen from the late twentieth century is the meditation tradition which was introduced and practiced in Chon Khong Monastery (1970-1986) in Vung Tau, and which, since 1974, has been taught and praticed in Thuong Chieu Zen Monastery in Ba Ria, Long Thanh (near Vung Tau), and other Truc Lam Yen Tu Zen monasteries in Vietnam. Founded by Most Venerable Thích Thanh Từ, this tradition unites three Chinese and Vietnamese Zen traditions : the first tradition is by Dazu Huike (487–593;494-601?) --the Second Patriarch of Chinese Chán/Zen and the twenty-ninth since Gautama Buddha; the second is by Dajian Huineng (638–713) --the Sixth and Last Patriarch of Chinese Chán/Zen Buddhism; and the third is by a Vietnamese king who was also the Truc Lam Yen Tu Zen Founder, King Tran Nhan Tong (1258-1308). King Tran Nhan Tong was the third emperor of the Trần Dynasty, reigning over Đại Việt (Vietnam nowadays)from 1278 to 1293.
Sources:
Thich Thanh Tu, Thien Tong Vietnam Cuoi The Ky 20. Written in Thuong Chieu Zen Monastery (1991). Circulated by Truc Lam Yen Tu Zen monasteries in Vietnam and abroad.
http://www.truclamvietzen.net/MasterTTT.htm
http://en.wikipedia.org/wiki/Thich_Thanh_Tu
Philip Taylor,Modernity and Re-enchantment: Religion in Post-Revolutionary Vietnam (Maryland, USA, 2008).
http://www.daophatngaynay.com/vn/phatgiao-vn/con-nguoi-vn/9709-Triet-hoc-Tran-Thai-Tong.html
http://www.daophatngaynay.com/vn/phatgiao-vn/con-nguoi-vn/3604-Phat-hoang-Tran-Nhan-Tong.html
http://www.daophatngaynay.com/vn/phatgiao-vn/con-nguoi-vn/4245-Phat-hoang-Tran-Nhan-Tong-viet-ve-Thay.html
http://www.daophatngaynay.com/vn/tu-sach-dao-phat-ngay-nay/6103-Chuong-12-Gioi-thieu-Mot-so-trung-tam-tu-hoc-tai-Viet-Nam.html