How many movies have Hwang Jang-Lee and William Cheung Kei collaborated on?

They have worked on 3 movies together! Their first movie together was The Story of the Dragon (1976) while their highest rated movie together was 鹰爪鬼手 (1981). They have not worked together since 鹰爪鬼手 (1981). They are most known for their action films together.