What are the visa & residency requirements in Hanoi?

"In order to visit Hanoi, visitors must obtain a visa prior to their arrival. The process of applying for a visa involves submitting an application form, a valid passport, and a passport-sized photograph to the Vietnamese Embassy or Consulate in the visitor's home country. Depending on the type of visa, additional documents may be required. In order to obtain residency in Hanoi, Vietnam, applicants must submit an application form, a valid passport, a passport-sized photograph, and other documents such as a birth certificate, marriage certificate, and proof of employment or financial resources. The application must be submitted to the local Immigration Office in Hanoi. After the application is approved, the applicant will be issued a residence permit," mentioned another expat when asked about moving to Hanoi, Vietnam.