His name is also romanized as: Chan Kowk Wai (Cantonese).
Shifu Chen learned a total amount of 30 barehand mantis forms; 25 plus 5 special ones which have very advanced techniques. The student under his tutelage who has learned the largest amount of barehand forms (16).
As shifu Chen has dedicated to the Northern Shaolin weapons forms he did not train the tang lang weapons forms, the only Tang Lang form he has learned is a double-axe form.