help oneself vs work out

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. 

work out

verb
  • Used other than figuratively or idiomatically: see work, out. 

  • To make sense of. 

  • To strengthen a part one’s body by exercise. 

  • To earn a wage working away from one's farm. 

  • To bring about or cause to happen by work or effort. 

  • To succeed; to result in a satisfactory situation. 

  • To conclude with the correct solution. 

  • To remove all the mineral that can be profitably exploited. 

  • To smooth or perfect. 

  • To exercise, especially by lifting weights. 

  • To calculate. 

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