How many movies have Helen Poon Bing-Seung and Mona Fong Yat-Wah collaborated on?

They have worked on 17 movies together! Their first movie together was The Cunning Hustler (1978) while their highest rated movie together was Heroes of the East (1978). They have not worked together since Passing Flickers (1982). They are most known for their action films together.