viable vs within possibility

viable

noun
  • An organism that is able to live and develop. 

adj
  • Capable of working successfully 

  • Able to live on its own (as for a newborn). 

  • Able to be done, possible, practicable, feasible. 

  • Able to live and develop. 

within possibility

How often have the words viable and within possibility occurred in a corpus of books? (source: Google Ngram Viewer )