Best way, by far, is to have all your licenses, certificates and logbook stamped, get a license verification and no accidents letter and a criminal background check and show up in the office at CT Plaza next to the airport in Saigon. Just book the hotel for a few days as sometimes the office gets a bit "empty" and it is difficult to catch up the thinking heads but if you are able to shake some hands you might get and interview on the spot. High season is coming!