digging vs search

digging

noun
  • The action performed by a person or thing that digs. 

  • A place where ore is dug, especially certain localities in California, Australia, etc. where gold is obtained. 

search

noun
  • An attempt to find something. 

  • The act of searching in general. 

verb
  • To look in (a place) for something. 

  • To look thoroughly. 

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