earn one's crust vs prevail

earn one's crust

verb
  • To earn money, to do something as a job. 

prevail

verb
  • To succeed in persuading or inducing. 

  • To be current, widespread, or predominant; to have currency or prevalence. 

  • To be superior in strength, dominance, influence, or frequency; to have or gain the advantage over others; to have the upper hand; to outnumber others. 

  • To triumph; to be victorious. 

How often have the words earn one's crust and prevail occurred in a corpus of books? (source: Google Ngram Viewer )