bakkie vs semi-trailer truck

bakkie

noun
  • A small pick-up truck or ute, generally open and sometimes fitted with a removable canopy, but distinct from an enclosed van and a large truck. 

  • A small bowl or container, sometimes with a cover such as a Tupperware container. 

semi-trailer truck

noun
  • A tractor-trailer or big rig, consisting of a semi-trailer and a semitruck pulling it. 

How often have the words bakkie and semi-trailer truck occurred in a corpus of books? (source: Google Ngram Viewer )