How many movies have Joanna Chan Pui-San and Sandra Ng Kwun-Yu acted in together?

They have worked on 6 movies together! Their first movie together was The Inspector Wears Skirts (1988) while their highest rated movie together was Vampire Vs. Vampire (1989). They have not worked together since The Inspector Wears Skirts IV (1992). They are most known for their action films together.