go through vs head for the hills

go through

verb
  • To travel from one end of something to the other. 

  • To use up or wear out (clothing etc.). 

  • To examine or scrutinize (a number or series of things). 

  • To enact or recite the entire length of (something). 

  • To progress to the next stage of something. 

  • To reach an intended destination after passing through some process. 

  • To undergo, suffer, experience. 

head for the hills

verb
  • To travel to a higher elevation, especially to a rural region on vacation. 

  • To go to a safe place; to seek refuge; to flee. 

How often have the words go through and head for the hills occurred in a corpus of books? (source: Google Ngram Viewer )