How many movies have Peter Cheung Yiu-Chung and Tina Lau Tin-Lan collaborated on?

They have worked on 3 movies together! Their first movie together was Night Caller (1985) while their highest rated movie together was Twinkle, Twinkle, Lucky Stars (1985). They have not worked together since Spooky, Spooky (1988). They are most known for their horror films together.