How many movies have Jeffrey Lau Chun-wai and Josephine Siao Fong-Fong collaborated on?

They have worked on 5 movies together! Their first movie together was Fist of Fury 1991 (1991) while their highest rated movie together was Mahjong Dragon (1997). They have not worked together since Mahjong Dragon (1997). They are most known for their comedy films together.