hereon vs over there

hereon

adv
  • To this place. 

  • On this subject or basis. 

  • On this place. 

  • Hereupon. 

over there

adv
  • To that place; thither (at some distance). 

  • overseas to Europe (for military engagement), especially to the Western Front in France during World War I 

  • In that place; there (at some distance). 

How often have the words hereon and over there occurred in a corpus of books? (source: Google Ngram Viewer )