How many movies have Ching Kuo-Chung and Stanley Chow Fook-Leung collaborated on?

They have worked on 7 movies together! Their first movie together was The Face Behind the Mask (1977) while their highest rated movie together was The Invincible Armour (1977). They have not worked together since Sleeping Fist (1979). They are most known for their action films together.