check up on vs go into

check up on

verb
  • To look after or inquire about someone's well-being. 

  • To examine or inspect something in order to determine its condition; to check out. 

go into

verb
  • To get involved in; to investigate or explore. 

  • To divide, to be a factor of. 

  • To attack; to assault physically. 

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

How often have the words check up on and go into occurred in a corpus of books? (source: Google Ngram Viewer )