only too vs very

only too

adv
  • to a high degree; very well or very much 

  • very, all too. 

very

adv
  • To a great extent or degree. 

  • Conforming to fact, reality or rule; true. 

  • Used to firmly establish that nothing else surpasses in some respect. 

adj
  • The same; identical. 

  • With limiting effect: mere. 

  • True, real, actual. 

How often have the words only too and very occurred in a corpus of books? (source: Google Ngram Viewer )