go for vs help oneself

go for

verb
  • Used other than figuratively or idiomatically: see go, for. 

  • To try for, to attempt to reach. 

  • To favor, accept; to have a preference for. 

  • To attack. 

  • To develop a strong interest in, especially in a sudden manner; to be infatuated with. 

  • To apply equally to. 

  • To undertake (an action); to choose an option. 

  • To suffice to be used for; to serve as. 

help oneself

verb
  • Used other than figuratively or idiomatically: see help. 

  • To serve oneself, especially to take food or other supplies, rather than wait to be served by another; used to indicate friendly permission or invitation. 

  • To exhibit self-control. 

  • To take something freely; to serve oneself without restraint. 

How often have the words go for and help oneself occurred in a corpus of books? (source: Google Ngram Viewer )