Dear Sir, My wife and I are retired SENIORS with Indian Pass Port, living in Singapore on a Social Long Stay Visa. We plan to travel through South East Asia: by train, during the month of August, 2010. Do we need a visa to enter and re-enter Vietnam during our to and fro journey? South East Asia : Singapore, Malaysia,Thailand, Cambodia, Vietnam, China, Taiwan, North Korea, South Korea and Japan
yes, you are required a multiple entry visa to enter/exit Vietnam multiple times from the countries you mentioned above.
hope that helps.