How many movies have Cheng Kei-Ying and Hon Kwok-Choi collaborated on?

They have worked on 9 movies together! Their first movie together was Ironside 426 (1977) while their highest rated movie together was The Gambler and His Kung Fu Master (1981). They have not worked together since The Sad Story of Saigon (1993). They are most known for their action films together.