push off vs vanish into thin air

push off

verb
  • To go away; to get lost. 

  • To delay, postpone, put off, push back. 

  • to commit a foul by pushing against an opponent to both accelerate more quickly and push the opponent in the opposite direction. 

vanish into thin air

verb
  • To disappear in a mysterious way. 

How often have the words push off and vanish into thin air occurred in a corpus of books? (source: Google Ngram Viewer )