Maoism vs neo-Marxism

Maoism

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

neo-Marxism

noun
  • Marxism updated for the modern world. 

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