change over vs convey

change over

verb
  • to convert to, to make a transition from one system to another 

convey

verb
  • To move (something) from one place to another. 

  • To communicate; to make known; to portray. 

  • To transfer legal rights (to). 

How often have the words change over and convey occurred in a corpus of books? (source: Google Ngram Viewer )