a small number vs dusting

a small number

dusting

noun
  • The act of removing dust from the furniture, as a household chore. 

  • A maintenance or comfort behaviour in which a bird flushes fine dirt through the feathers; dust-bathing. 

  • A light snowfall. 

  • A light covering of something. 

  • A beating. 

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