Kuki vs Zomi

Kuki

noun
  • Any member of numerous clans of hillspeople, found in parts of India, Burma and Bangladesh, with mongoloid features, straight black hair, and brown eyes and skin. 

Zomi

noun
  • The Zou people who speak the Zou language, a Northern Kukish language. 

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