drive at vs lead up to

drive at

verb
  • To mean, signify; to get at, to aim or tend to a point. 

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

lead up to

verb
  • To follow or mark a path toward. 

  • To set in motion; to act as a causal or preparatory event or sequence of events. 

  • To precede in time. 

How often have the words drive at and lead up to occurred in a corpus of books? (source: Google Ngram Viewer )