The first business contacts with nationals of Viet Nam should contact through an intermediary (Third Party) If a third party mediator so neither nationals of Viet Nam, trust and know well, it makes business or continue a relationship between them as a go more smoothly, however. If you can't find a mediator in preferences, it may send a letter or document recommended, including the appointment in writing. Identifying the purpose of a business is also straightforward and compact.