2 years after graduating from École Supérieure des Beaux-Arts d’Indochine, Phai joined the August resistance in Hanoi and took part in artistic activities in Northern Vietnam from 1947 to 1952. In 1957, Phai became a member of the Vietnam Fine Arts Association.
Following his graduation from École Supérieure des Beaux-Arts d’Indochine, Phai joined the August resistance in Hanoi and engaged in artistic endeavors in Northern Vietnam between 1947 and 1952. Two years later, Phai became a member of the Vietnam Fine Arts Association.