Philippine cobra vs cobra

Philippine cobra

noun
  • Naja philippinensis, is a stocky, highly venomous species of spitting cobra native to the northern regions of the Philippines. 

cobra

noun
  • Any of various venomous snakes of the family Elapidae. 

  • A type of lanyard knot, thought to resemble a snake in its shape. 

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