Joe, I would advise you start with just PO:
PRO: (city and province) and VT: RT: (obv./rev. main
type). That way you will get some results you
search further with control F. It remains a pain to find out which way you have to spell all these things. Getting no results may mean you misspelled, not that it doesn't exist. You can always master more of these
search angles later.
Regards
Gert