perfect storm vs quagmire

perfect storm

noun
  • A situation whereby several problems come together and make everything worse. 

  • A powerful hurricane or other major weather disturbance, especially as produced by a combination of meteorological conditions. 

quagmire

noun
  • A perilous, mixed up and troubled situation; a hopeless tangle. 

  • A swampy, soggy area of ground. 

verb
  • To embroil (a person, etc.) in complexity or difficulty. 

How often have the words perfect storm and quagmire occurred in a corpus of books? (source: Google Ngram Viewer )