go after vs run away

go after

verb
  • To pursue in attempt to catch another. 

  • To pursue an object or a goal. 

run away

verb
  • To leave home, or other place of residence, usually unannounced, or to make good on a threat, with such action usually performed by a child or juvenile. 

  • To become a runaway. 

  • To flee by running. 

How often have the words go after and run away occurred in a corpus of books? (source: Google Ngram Viewer )