aperçu vs bird's-eye view

aperçu

noun
  • A summary or outline; words that summarize. 

  • A clever insight. 

bird's-eye view

noun
  • A general overview or summary of a topic. 

  • The view from directly or high above. 

How often have the words aperçu and bird's-eye view occurred in a corpus of books? (source: Google Ngram Viewer )