break free vs disappear

break free

verb
  • To liberate oneself; to free oneself; to become free (from or of something or someone). 

disappear

verb
  • To go missing; to become a missing person. 

  • To make vanish; especially, to abduct and murder surreptitiously for political reasons. 

  • To go away; to become lost. 

  • To vanish. 

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