How many movies have Chin Kang and Lai Wen-hsiung collaborated on?

They have worked on 4 movies together! Their first movie together was 天羅,飛沙,夕陽紅 (1976) while their highest rated movie together was The Invincible Kung Fu Trio (1977). They have not worked together since Murder of Murders (1978). They are most known for their action films together.