claw back vs get back

claw back

verb
  • To recover or retake, with great effort, something that was lost, often by a government or official agency. 

get back

verb
  • To retrieve, to have an item returned. 

  • Return to where one came from. 

  • To do something to hurt or harm someone who has hurt or harmed one; to take revenge. 

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