You are able to also check the Vietnam Embassy site. You should find out how to cross the road if you intend to walk around Hanoi. With this way, you've got to come right to the Vietnam embassy at least two times.
Also, take note there are restrictions on when you are able to re-enter Vietnam using a visa exemption. Moreover, the price of Vietnam visa is based on which sort of visa you decide to get. It's different from the kind of visa you would like to get.
2019-9 - 2019-9
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