come by vs get one's mitts on

come by

verb
  • To come near to; to pass; to visit. 

  • To obtain; to get, especially by chance or involuntarily. 

intj
  • A command to a sheepdog to move clockwise around the sheep 

get one's mitts on

How often have the words come by and get one's mitts on occurred in a corpus of books? (source: Google Ngram Viewer )