What kind of culture shock do you think foreigners may experience in Viet Nam? What will you do to help them overcome it?

Visitors may different kinds of when they come to Viet Nam. For example, they may not be used to using when eating or enjoying many in the streets. Some may find Vietnamese people in different regions (the North, Middle and the South) have different .
To help these visitors, we can with them and guide them when they want to the city or culture. Moreover, we can design some clips or to introduce special of Vietnamese culture and some they should avoid.