old saw vs saga

old saw

noun
  • A cliché, saying, or overused expression; especially a proverb or maxim. 

saga

noun
  • Something with the qualities of such a saga; an epic, a long story. 

  • An Old Norse (Icelandic) prose narrative, especially one dealing with family or social histories and legends. 

How often have the words old saw and saga occurred in a corpus of books? (source: Google Ngram Viewer )