How many movies have Kitty Chung Kit-Yee and Yip Wai-Ying collaborated on?

They have worked on 3 movies together! Their first movie together was Tough Cop Inside (2001) while their highest rated movie together was Crazy for Pig-Bone in Pot (2001). They have not worked together since Money Suckers (2002). They are most known for their comedy films together.