get on to vs turn to

get on to

verb
  • Used other than figuratively or idiomatically: see get on, to. 

  • To contact (someone) in order to raise or discuss a certain matter. 

  • To progress to; to start working on. 

turn to

verb
  • Used other than figuratively or idiomatically: see turn, to. 

  • To consult for advice or help. 

  • To become, to degenerate into. 

  • To direct one's attention or efforts toward something. 

  • To start to do or to use something in an attempt to deal with a difficult and unpleasant situation. 

How often have the words get on to and turn to occurred in a corpus of books? (source: Google Ngram Viewer )