The Vietnamese word "hàng hiên" refers to a "verandah," which is a roofed, open-air gallery or porch that is attached to the outside of a building. It is usually located at the front or side of the house and is often used for relaxation, socializing, or enjoying the view outdoors while being partially sheltered from the weather.
While "hàng hiên" primarily refers to a verandah, in some contexts, it may also be used more generally to indicate any outdoor space or balcony that is part of a building.