chain store vs corner shop

chain store

noun
  • A retail outlet that is one of a group of similar establishments having common format, contents, ownership and management. 

corner shop

noun
  • A small retail store, often in a residential area, that carries a limited selection of everyday items such as newspapers, sweets and stationery, and is open long hours for the convenience of shoppers. 

How often have the words chain store and corner shop occurred in a corpus of books? (source: Google Ngram Viewer )