Korean foot vs cha

Korean foot

cha

noun
  • Synonym of Korean foot: a traditional unit of length equivalent to about 30.3 cm. 

  • tea, sometimes (dialect) specifically masala chai 

pron
  • You. 

particle
  • Used to count out steps, particularly involving the hip-shaking sections of rhythmic Latin dances 

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