How many movies have Hwang Jang-Lee and Ng See-Yuen collaborated on?

They have worked on 11 movies together! Their first movie together was The Secret Rivals (1976) while their highest rated movie together was Ninja In The Dragon's Den (1982). They have not worked together since No Retreat, No Surrender 2: Raging Thunder (1987). They are most known for their action films together.