brain-washing vs indoctrination

brain-washing

noun
  • A form of indoctrination that forces people to abandon their beliefs in favour of another set of beliefs by conditioning through various forms of pressure or torture 

indoctrination

noun
  • The act of indoctrinating, or the condition of being indoctrinated 

  • Instruction in the rudiments and principles of any science or belief system; information. 

How often have the words brain-washing and indoctrination occurred in a corpus of books? (source: Google Ngram Viewer )