cast about vs forage

cast about

verb
  • To try to find; look around; search. 

  • To plan; plot; contrive. 

forage

verb
  • Of an animal: to seek out and eat food. 

  • To rampage through, gathering and destroying as one goes. 

  • To rummage. 

  • To search for and gather food for animals, particularly cattle and horses. 

noun
  • Fodder for animals, especially cattle and horses. 

  • An act or instance of foraging. 

How often have the words cast about and forage occurred in a corpus of books? (source: Google Ngram Viewer )