[jump88]

At TSN airport if you do not want to line up for a taxi. When you come out of customs do not exit the terminal. Go all the way to the right. There will be a Mai Linh Taxi booth. Buy a voucher for the taxi.

Now exit the terminal and turn left. Walk to the taxi stand, but cross to the center island. Give your voucher to the Mai Linh Taxi attendant and you can get a cab right away without waiting.

Mai Linh Taxi is a legit taxi company. It is available throughout Vietnam.
Vinasun is only in HCMC.