Tipping is not a common practice in Vietnam, but it is appreciated if you choose to do so. In general, tipping is not expected for most services, but you can consider rounding up the bill or leaving a small amount of change as a token of appreciation. For example, at restaurants, you can round up the bill to the nearest thousand dong.

If you are receiving exceptional service or taking a tour, tipping the tour guide or driver is also appreciated. The amount can vary depending on the level of service, but a general guideline is to give about 10% of the total cost of the tour as a tip.

In some high-end hotels or restaurants, a service charge may be included in the bill. In this case, tipping is not necessary. However, if you receive exceptional service, you can still choose to tip separately.

It's worth noting that tipping is not a part of Vietnamese culture, and many locals may not understand the concept or may feel uncomfortable receiving it. So, while it's appreciated to show gratitude for good service, it's important to respect local customs and not overdo it.