The Vietnamese word "bộ" is a versatile noun that has several meanings and usages.
Appearance / Look: "Bộ" can refer to the way someone looks or carries themselves. For example, if someone walks in a particular way, you might say they have a certain "bộ đi" (gait).
Capability / Judgement: It can also imply judgment about someone's abilities or capabilities, sometimes with a connotation of disdain.
Set / Collection: "Bộ" can refer to a set of things, such as a collection of items, or in a more specific sense, a set of bones or a skeleton.
"Coi bộ" is a colloquial phrase that can mean "it looks like" or "it seems."
"Rung đùi ra bộ đắc ý" can be translated as "to stir one's knee with a satisfied look," indicating a sense of pride or self-satisfaction in one's appearance or demeanor.