get through vs sustain oneself

get through

verb
  • To be made successfully; to reach the addressee. 

  • To complete; to finish. 

  • To overcome; to endure. 

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

sustain oneself

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