share taxi vs songthaew

share taxi

noun
  • A vehicle for hire, typically smaller than a bus, taking passengers on a fixed or semi-fixed route without timetables, departing when all seats are filled. 

songthaew

noun
  • A type of share taxi in Southeast Asia made out of an altered pickup truck with two benches in the back down each side. 

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