pursue vs run after

pursue

verb
  • To follow urgently, originally with intent to capture or harm; to chase. 

  • To follow, travel down (a particular way, course of action etc.). 

  • To aim for, go after (a specified objective, situation etc.). 

  • To participate in (an activity, business etc.); to practise, follow (a profession). 

  • To act as a legal prosecutor. 

run after

verb
  • To follow quickly, often in an effort to catch or catch up with (someone or something). 

  • To endeavour to find or obtain. 

  • To make a determined effort to win someone's affections or to have a sexual relationship with them. 

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