move ahead vs prolong

move ahead

verb
  • to continue without being distracted; to keep going 

  • to proceed; to make or signify progress 

  • to go on to something else 

prolong

verb
  • To put off to a distant time; to postpone. 

  • To lengthen in time; to extend the duration of 

  • To become longer; lengthen. 

  • To extend in space or length. 

How often have the words move ahead and prolong occurred in a corpus of books? (source: Google Ngram Viewer )