rickshaw vs velotaxi

rickshaw

noun
  • A two-wheeled carriage pulled along by a person. 

verb
  • To move someone by means of a rickshaw. 

velotaxi

noun
  • pedicab, cycle rickshaw (cycle rickshaw used as taxi) 

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