maltreatment vs manipulation

maltreatment

noun
  • Cruel or harmful treatment or abuse; mistreatment. 

manipulation

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

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

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

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