Maoism vs social democracy

Maoism

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

social democracy

noun
  • A moderate political philosophy or ideology that aims to achieve socialist (socialistic) goals within a democratic society and a liberal democracy such as by means of a strong welfare state and regulation of private industry. 

  • A society based on this ideology. 

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