How many movies have Mona Fong Yat-Wah and Robert Mak Tak-Law collaborated on?

They have worked on 16 movies together! Their first movie together was Crippled Avengers (1978) while their highest rated movie together was To Kill A Mastermind (1979). They have not worked together since The Siamese Twins (1984). They are most known for their action films together.