Chinese wolfberry vs Himalayan goji

Chinese wolfberry

noun
  • Either of two Chinese species of spiny shrub in the nightshade family, Lycium barbarum and Lycium chinense, and their edible fruits, which are used in East Asian traditional medicine. 

Himalayan goji

How often have the words Chinese wolfberry and Himalayan goji occurred in a corpus of books? (source: Google Ngram Viewer )