truck farm vs vegetable garden

truck farm

noun
  • A small-scale farm intermediate between a garden and a full-scale farm involving the use of tractors or livestock. 

vegetable garden

noun
  • A small garden, attached to a house, where vegetables, herbs and fruit are grown for household use; sometimes includes cold frames and greenhouses. 

How often have the words truck farm and vegetable garden occurred in a corpus of books? (source: Google Ngram Viewer )