We are (UKcitizens) planning to come to vietnam from HK on the 20th Nov 09 to Hanoi by air, spend a few days there, then go to Cambodia for a week. Then we are planning to go back to vietnam, by land (not decided which route yet). probably to HCMC, then go to Hanoi again to catch a flight back to HK . So we will be entering Vietnam twice, once by air and once by land within a matter of 2 weeks. What type of visa suits us best please advise .