How many movies have Cai Văn Mỹ and Phan Hiền Khánh acted in together?

They have worked on 4 movies together! Their first movie together was Cards on the Table: The Foster Son of the Archbishop (1982) and was their highest rated movie together. They have not worked together since Cards on the Table: Blue Sky in the Split of Leaf (1985). They are most known for their war films together.