keep going vs keep someone's head above water

keep going

verb
  • To proceed; to make progress, physically or figuratively. 

  • To see that (a person) is continually supplied with something, or that they can progress or carry on. 

  • To continue functioning. 

keep someone's head above water

How often have the words keep going and keep someone's head above water occurred in a corpus of books? (source: Google Ngram Viewer )