set back vs speed something up

set back

verb
  • To remove from or allow distance. 

  • To delay or obstruct. 

  • To install or position behind a boundary or surface, or in a recess. 

  • To cost money. 

  • To reverse, go backwards. 

speed something up

How often have the words set back and speed something up occurred in a corpus of books? (source: Google Ngram Viewer )