Chinkland vs Middle Kingdom

Chinkland

name
  • Synonym of China 

  • Synonym of East Asia or (chiefly US) Asia misunderstood as an extension of East Asia. 

Middle Kingdom

name
  • China. 

  • Egypt from the time of its reunification under Mentuhotep II in the 11th Dynasty (ending the First Intermediate Period) to its disintegration during the 13th Dynasty and the beginning of the Second Intermediate Period. 

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