exert vs plough into

exert

verb
  • To put in vigorous action. 

  • To make use of, to apply, especially of something non-material. 

plough into

verb
  • To engage in some activity with vigor. 

  • To crash into something. 

  • To invest a resource (money, material, energy) into something. 

How often have the words exert and plough into occurred in a corpus of books? (source: Google Ngram Viewer )