diprotium monoxide vs μ-oxido dihydrogen

diprotium monoxide

noun

  • A humorous chemical name for "water." 

μ-oxido dihydrogen

noun

  • An alternative systematic name for water, H₂O. 

How often have the words diprotium monoxide and μ-oxido dihydrogen occurred in a corpus of books? (source: Google Ngram Viewer )