The Vietnamese word "vân vân" is used to mean "et cetera" or "and so on." It is often used at the end of a list to indicate that there are more items that could be included but are not explicitly mentioned. This word helps to avoid listing everything when the items are similar or related.
In more complex sentences, "vân vân" can also be used to summarize a longer list or to indicate that the listener should understand that there are many more examples that follow the same pattern.
There are no direct variants of "vân vân," but you might come across similar phrases like "và nhiều cái khác" which also means "and many other things."
The primary meaning of "vân vân" is to indicate additional items or examples. It does not have other meanings but can be used in various contexts where a list is implied.