Japayuki-san vs working girl

Japayuki-san

noun
  • A Filipina who travels to Japan to work as an entertainer, with implications of prostitution. 

working girl

noun
  • A female prostitute. 

  • Used other than figuratively or idiomatically: see working, girl. 

How often have the words Japayuki-san and working girl occurred in a corpus of books? (source: Google Ngram Viewer )