help oneself vs take over

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. 

take over

verb
  • Used other than figuratively or idiomatically: see take, over. 

  • To become more successful (than someone or something else). 

  • To assume control of something, especially by force; to usurp. 

  • To appropriate something without permission. 

  • To adopt a further responsibility or duty. 

  • To buy out the ownership of a business. 

  • To relieve someone temporarily. 

  • To annex a territory by conquest or invasion. 

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