elude vs slip through the cracks

elude

verb
  • To escape being understandable to; to be incomprehensible to. 

  • To escape someone's memory, to slip someone's mind. 

  • To evade or escape from (someone or something), especially by using cunning or skill. 

  • To shake off (a pursuer); to give someone the slip. 

slip through the cracks

verb
  • To escape notice or lack sufficient attention. 

How often have the words elude and slip through the cracks occurred in a corpus of books? (source: Google Ngram Viewer )