Machiavellianism vs manipulation

Machiavellianism

noun
  • A psychological trait centered on interpersonal manipulation, unemotional coldness, and indifference to morality. 

  • Any ruthless, duplicitous behavior. 

  • A political philosophy, based on the writings of Machiavelli, especially The Prince, that advocates the use of ruthlessness and duplicity in political dealings. 

  • A political maneuver that exemplifies the philosophy. 

manipulation

noun
  • The usage of psychological influence over a person, event, or situation to gain a desired outcome. 

  • The practice of manipulating or the state of being manipulated. 

  • The skillful use of the hands in, for example, chiropractic. 

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