BUỒN NHƯ CON CHUỒN CHUỒN
Buồn means sad.
Như means as/like (Equally comparison).
Con chuồn chuồn is a dragonfly.
“Buồn” and “chuồn chuồn” share the same rhyme (or “vần” in Vietnamese) “uồn” that make this idiom more interesting when pronouncing.
Buồn như con chuồn chuồn simply means sad. It is often used when something doesn’t go the way you want it to be.