falsify vs manipulate

falsify

verb
  • To counterfeit; to forge. 

  • To misrepresent. 

  • To alter so as to make false; to make incorrect. 

  • To prove to be false. 

  • To show (an item of charge inserted in an account) to be wrong. 

manipulate

verb
  • To influence or control someone in order to achieve a specific purpose, especially one that is unknown to the one being manipulated and beneficial to the manipulator; to use 

  • To move, arrange or operate something using the hands 

  • To handle and move a body part, either as an examination or for a therapeutic purpose 

  • To influence, manage, direct, control or tamper with something 

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