The Vietnamese word "bán rao" has a couple of meanings and uses, which can help you understand how to use it in different contexts.
As a Verb: "bán rao" can mean "to cry out" or "to shout." It often refers to vendors who shout to attract customers. For example, a vendor selling roasted groundnuts might "bán rao" to get people's attention.
As a Noun: "bán rao" can refer to a type of noisy promotion or ballyhoo, often associated with a spectacle or show that is exaggerated or ridiculous.
In advanced contexts, "bán rao" can be used metaphorically to describe situations where someone is making a lot of noise or fuss about something that may not be very significant.