jobbing vs working for oneself

jobbing

adj
  • That does odd jobs; that works on occasional jobs as available. 

noun
  • The fact or practice of using a public office or other position of trust for personal gain. 

  • Buying and selling stocks or goods for profit; mercenary trading. 

  • Work carried out by the job; piecework, odd-job work. 

working for oneself

How often have the words jobbing and working for oneself occurred in a corpus of books? (source: Google Ngram Viewer )