Thọ was born in 1955. Thọ's father is Toàn and her mother was Viêm Nguyễn. Her paternal grandparents were Thu and Tiệp Trịnh. She has two brothers and four sisters, named Thái, Thắng, Ninh, Bình, Khanh and Hòa. She is the fourth oldest of the seven children.