In Vietnam when you are a foreigner, it is easy to open and office to host your activities but opening a shop selling the population is much more complicated. It requires an additional authorization that is called “Giấy phép lập cơ sở bán lẻ đối với công ty có vốn đầu tư nước ngoài“. For instance if you open a coffee shop selling products to be consume quickly (less than one week), this sub-license is not required but if you sell coffee in your coffee shop (the beans or the powder), a sub-license will be required. It is somehow costly to request for one if you are a foreigner. Therefore you should seek proper advice when open a shop!