Chinese brown sauce vs brown sauce

Chinese brown sauce

brown sauce

noun
  • Gravy. 

  • A sauce made by the addition of stock to a heated and browned mixture of butter and flour. 

  • Any of many brands of bottled sauce based on malt vinegar, fruit and spices. 

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