Tuân was born on March 23rd, 1950 in Hà-nội. Tuân's father is Khoa and his mother was Thanh-Thảo Phan. His paternal grandparents were Ngạc and Nhất Trần thị. He has four brothers and a sister, named Khiêm, Nhượng, Đàm, Luận and Thúy-Hồng. He is the third oldest of the six children.