fostering vs furtherance

fostering

noun
  • encouragement; aiding the development of something 

  • raising someone to be an accepted member of the community. 

furtherance

noun
  • The act of furthering or helping forward 

  • Promotion. 

  • Advancement or progress. 

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