articulated lorry vs lorry

articulated lorry

noun
  • A tractor-trailer or big rig, consisting of a semi-trailer and a semitruck pulling it; in American English referred to as semi-trailer truck or 18-wheeler. 

lorry

noun
  • A large and heavy motor vehicle designed to carry goods or soldiers; a truck 

  • a truck with an open carriage 

verb
  • To transport by, or as if by, lorry. 

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