get across vs get through

get across

verb
  • To cross; to move from one side (of something) to the other, literally or figuratively. 

  • To make an idea evident; to successfully explain a thought or feeling; put over. 

get through

verb
  • To communicate successfully; to make contact, or get one's point across. 

  • To be made successfully; to reach the addressee. 

  • To complete; to finish. 

  • To overcome; to endure. 

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