How many movies have Mona Fong Yat-Wah and Poon Man-Wah collaborated on?

They have worked on 9 movies together! Their first movie together was The Duel of the Century (1981) while their highest rated movie together was Three Stooges Go Undercover (1984). They have not worked together since My Name Ain't Suzie (1985). They are most known for their action films together.