You need a visa for Hong Kong SAR if you have a Vietnamese passport
Visa options for Hong Kong SAR
Electronic visa (eVisa)
Electronic visitor visa
Travelers need a visa to visit Hong Kong for Business or Tourism. A Hong Kong eVisa is the fastest and easiest way of obtaining a visa for Hong Kong because travelers can submit their application and supporting documents online. Once the application is approved, travelers receive their eVisa confirmation electronically. A valid visa is required to board the flight. If the visa is expired or doesn’t match the traveler’s passport information, travelers will not be able to board their flight.
This is not offered by sherpa°.
Apply on the government site.
