Super Power
A dying Manchu kung fu fighter sends his three sons on a mission of revenge against the five Southern champs who defeated and humiliated him a generation ago. The three Manchus enter the town where the old champs live and begin challenging and fighting an unprepared group of once-powerful martial artists and their sons. After his counterparts in the other families take some serious beatings, Billy is forced to take a crash course from a noted teacher in North and South Eagle styles as well as Horsehead Fist. Only then is he able to confront each of the three Manchu fighters.
Starring Willy Dozan, Chiang Tao, Fung Ging-Man, Hau Chiu-Sing, Lau Dan, Annie Liu On-Lai, Jimmy Wong Chi-ming, Wong Chi-Ming, Wang Han-Chen, Lau Hok-Nin
Watch "Super Power" on Amazon released in 1980. It's a drama and action & adventure movie, and has a rating of 6.5 out of 10 from Imdb which is usually fine for this kind of movie, and is currently only available for purchase or rent.