He replaced Nguyễn Văn Hinh as Chief of the Joint General Staff.

[2] He was previously a general in the Vietnamese National Army of the State of Vietnam, which became the Republic of Vietnam in 1955 after Prime Minister Ngô Đình Diệm deposed Emperor Bảo Đại in a fraudulent referendum.

During the First Indochina War, he was appointed brigadier general in the Vietnamese National Army.

[3] Tỵ's deteriorating health forced him to retire in 1964.

This biographical article about the military of Vietnam is a stub.