intangible vs not material

intangible

noun
  • Anything intangible 

  • Incorporeal property that is saleable though not material, such as bank deposits, stocks, bonds, and promissory notes 

adj
  • Incapable of being perceived by the senses; incorporeal. 

not material

How often have the words intangible and not material occurred in a corpus of books? (source: Google Ngram Viewer )