Asian pear vs apple pear

Asian pear

noun
  • the apple pear or Chinese pear, Pyrus pyrifolia 

  • the Chinese white pear, Pyrus × bretschneideri 

apple pear

noun
  • Pyrus pyrifolia, the tree that bears this fruit. 

  • A fruit of a northeast-Asian species of pear with a crisp, juicy texture and an apple-like shape. 

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