The implied smile has a specific meaning in each context. Vietnamese rely more often on nonverbal communication than others countries. So it is possible a source of confusion. For Vietnamese, replying on a smile is not always he or she is happy. It would be to express sadness. They occasionally smile when they feel sad or misery because they don’t want to drop their tears and not want to hurt others. They want to keep it themselves and smiles make them stonger. Similarly, nervousness is indicated by a smile. It is due to hiding their nervousness which helps theem be more confident before doing something such as joining an exam, or an interview, etc. These are just some specific meaning of smile in Vietnam. To know what a Vietnamese smile means, it’s very necessary to understand its culture and people.