keep on with vs wage

keep on with

wage

noun
  • An amount of money paid to a worker for a specified quantity of work, usually calculated on an hourly basis and expressed in an amount of money per hour. 

verb
  • To conduct or carry out (a war or other contest). 

  • To adventure, or lay out, for hire or reward; to hire out. 

How often have the words keep on with and wage occurred in a corpus of books? (source: Google Ngram Viewer )