tough break vs unluckiness

tough break

noun
  • A situation resulting in misfortune or hardship; an instance of bad luck. 

intj
  • An interjection of mild or insincere sympathy for someone else's misfortune. 

unluckiness

noun
  • The state, quality, or condition of being unlucky or unfortunate; misfortune. 

How often have the words tough break and unluckiness occurred in a corpus of books? (source: Google Ngram Viewer )