What are the visa & residency requirements in Vietnam?

"To enter Vietnam, foreign visitors must apply for a visa prior to their travel. Citizens from certain countries can apply for a visa on arrival, while other nationalities must apply in advance for a visa through a Vietnamese embassy or consulate in their country of origin. To apply for a visa, travelers must submit the appropriate application form, valid passport, copies of their passport and a passport photo, and the necessary visa fee. To apply for residency in Vietnam, foreign nationals must submit a valid passport, a valid visa, proof of medical insurance, a medical certificate, notarized copies of educational documents, valid return flight tickets and proof of sufficient funds. Depending on the type of visa and residence permit, additional documents may be required. After the necessary documents are submitted and approved, the foreign national can receive a residency card that is valid for one year," said another expat in Vietnam.