focusing vs subject matter

focusing

noun
  • The action of the verb to focus. 

adj
  • Used for or pertaining to focusing. 

  • Pertaining to the direction of attention, effort, or energy to a particular audience or purpose over time. 

subject matter

noun
  • The matter or thought presented for consideration in some statement or discussion; that which is made the object of thought or study. 

How often have the words focusing and subject matter occurred in a corpus of books? (source: Google Ngram Viewer )