How many movies have Cheung Foo-Wing and Lau Kar-Wing collaborated on?

They have worked on 3 movies together! Their first movie together was Dirty Tiger, Crazy Frog (1978) while their highest rated movie together was Tiger on the Beat (1988). They have not worked together since Aces Go Places V: The Terracotta Hit (1989). They are most known for their comedy films together.