lead astray vs string on

lead astray

verb
  • To cause (someone) to believe an untruth. 

  • To influence (someone) to have bad habits or to behave improperly or illegally 

  • To misguide or misdirect. 

string on

verb
  • To continue to convince (someone) of something untrue; to maintain a lie or scam aimed at (someone). 

How often have the words lead astray and string on occurred in a corpus of books? (source: Google Ngram Viewer )