Most senior staff in large and international companies will speak English but it is not common in smaller companies. It is essential to make appointments for business meetings and to exchange business cards.
Vietnamese are quite likely to present visitors with a gift, such as laquerware, so visitors should take along a small gift from their home country in order to reciprocate. It is important to realise that the Vietnamese do not like to say no to any request, so arrangements and contracts should be checked and rechecked.
Vietnamese business people are gradually becoming more formal in their dress, as contact with international business increases. However, because of the extreme heat, it is quite acceptable, and practical, to dispense with the wearing of a suit jacket.