cover story vs makeshift

cover story

noun
  • A fictitious account that is intended to hide one's real motive. 

  • A story included in a publication that is highlighted on the front cover. 

makeshift

noun
  • A temporary (usually insubstantial) substitution. 

adj
  • Made to work or suffice; improvised; substituted. 

How often have the words cover story and makeshift occurred in a corpus of books? (source: Google Ngram Viewer )