How many movies have John Wilford and Tomas Tang Kaak-Yan collaborated on?

They have worked on 4 movies together! Their first movie together was Ninja and the Warriors of Fire (1987) while their highest rated movie together was Death Code: Ninja (1987). They have not worked together since Ninja, Phantom Heros U.S.A. (1987). They are most known for their action films together.