feel out vs strike a chord

feel out

verb
  • To try to ascertain a person's point of view, or the nature of a situation, by cautious and subtle means. 

strike a chord

verb
  • To convey a feeling or meaning which someone personally internalizes and takes to heart. 

  • To elicit a significant reaction, especially one which is favorable or sympathetic. 

How often have the words feel out and strike a chord occurred in a corpus of books? (source: Google Ngram Viewer )