The Little Dragons (1979) aka Karate Kids USA

Karate experts attempt to rescue a girl who was kidnapped by a mother and her two psycho sons.

Director:

 Curtis Hanson

Writers:

 Harvey Applebaum, Louis G. Atlee, 2 more credits »

Stars:

 Charles Lane, Ann Sothern, Chris Petersen - via IMDB 

https://archive.org/details/KarateKidsUSA