come for vs go at

come for

verb
  • Used other than figuratively or idiomatically: see come, for. 

  • To search for someone with the intent to apprehend or cause harm. 

  • To target someone for competition or attack. 

go at

verb
  • Used other than figuratively or idiomatically: see go, at. 

  • To try to solve a problem a specific way; to undertake a task. 

  • To initiate an attack on or an argument with. 

How often have the words come for and go at occurred in a corpus of books? (source: Google Ngram Viewer )