fair play vs fair-mindedness

fair play

noun
  • Good behavior; conduct (in sports or another endeavor) that is respectful of the rules, the spirit of the activity, and the adversary. 

phrase
  • used to acknowledge or congratulate for something. 

fair-mindedness

noun
  • The characteristic of being fair-minded. 

How often have the words fair play and fair-mindedness occurred in a corpus of books? (source: Google Ngram Viewer )