go at vs undertake

go at

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

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

  • To initiate an attack on or an argument with. 

undertake

verb
  • To take upon oneself; to start, to embark on (a specific task etc.). 

  • To commit oneself (to an obligation, activity etc.). 

  • To pass a slower moving vehicle on the curbside rather than on the side closest to oncoming traffic. 

noun
  • The passing of slower traffic on the curbside rather than on the side closest to oncoming traffic. 

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