| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | bicycle helmet | Vietnam | Less commonly used, especially in urban areas with heavy traffic | 1 |
| 2 | helmet | Vietnam | Wearing helmets is less common, particularly for cycling and motorcycle riding, and not always enforced by local authorities. | 1 |
| 3 | motorbike helmet | Vietnam | Often shared or borrowed among friends and family | 1 |