Maoism vs radicalism

Maoism

noun
  • The philosophy espoused by Chinese leader Mao Zedong, a form of Marxism-Leninism that focuses on the peasantry as the revolutionary vanguard. 

radicalism

noun
  • Any of various radical social or political movements that aim at fundamental change in the structure of society 

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