inspection vs vehicle inspection

inspection

noun
  • An organization that checks that certain laws or rules are obeyed. 

  • The act of examining something, often closely. 

vehicle inspection

noun
  • A procedure mandated by national or subnational governments in many countries, in which a vehicle is inspected to ensure that it conforms to regulations governing safety, emissions, or both. Inspection can be required at various times, e.g., periodically or on transfer of title to a vehicle. 

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