plunge in vs set forward

plunge in

verb
  • To start a new endeavor enthusiastically and wholeheartedly, though possibly without experience. 

set forward

verb
  • To set off, set forth; to start. 

  • To help or assist (a person, project etc.); to promote. 

  • To propose, suggest (an opinion, theory etc.). 

  • To put or carry (something) forward. 

How often have the words plunge in and set forward occurred in a corpus of books? (source: Google Ngram Viewer )