discuss vs read through

discuss

verb
  • To examine or search thoroughly; to exhaust a remedy against, as against a principal debtor before proceeding against the surety. 

  • To converse or debate concerning a particular topic. 

read through

verb
  • To thoroughly read something to check or proofread it 

  • To read and obey a signal that is beyond the applicable one (often mistakenly) 

  • To read a script out loud casually with other actors but without blocking 

How often have the words discuss and read through occurred in a corpus of books? (source: Google Ngram Viewer )