The Vietnamese word "khứu" primarily relates to the sense of smell. It is often used in combination with other words to refer to smelling or the ability to detect scents.
In more advanced contexts, "khứu" can be used in phrases related to the perception of smells or in discussions about aromas in various settings, such as cooking, perfumery, or even in nature.
While "khứu" mainly refers to smelling, it can also imply an awareness of something through smell. It does not have many alternative meanings beyond its connection to the olfactory sense.
"Khứu" is a useful word when discussing smell in Vietnamese.