thereof vs this way

thereof

adv
  • From that circumstance or origin; therefrom, thence. 

  • Of this, that, or it. 

this way

adv
  • As a consequence. 

  • In the way indicated; as follows; thus 

noun
  • In the indicated direction or manner. 

How often have the words thereof and this way occurred in a corpus of books? (source: Google Ngram Viewer )