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Asio is a genus of typical owls, or true owls, in the family Strigidae. 

1/ Short-eared owl (Cú lửa, Asio flammeus)

The genus name Asio is from asiō, the Latin name used by Pliny the Younger for a type of horned owl, the feather tufts on the head of these owls give the appearance of "ears" which is a defining characteristic.

Ninox is a genus of true owls or typical owls comprising 36 species found in Asia and Australasia. Many species are known as hawk-owls or boobooks, but the northern hawk-owl (Surnia ulula) is not a member of this genus.

Strigiformes: All Owls are classified as members of this order. The name is formed from "Strig", the plural form of the Latin word "strix", meaning "owl" and "formes", meaning "forms".
Strigidae: The family for all Owls except Barn Owls, derived from "Strix", a Latin word for owl (also the same in Greek).
Ninox: 
- In Greek mythology, the Latin word, Nisus, is the king of Megara who turned into a hawk. 
- The Latin word, noctua, refers to owl. 
- Ninox: derived by Hodgson in 1837 to describe the hawk-like appearance of Ninox nipalensis; junior synonym for Ninox scutulata lugubris.

1/ Brown boobook (Cú vọ lưng nâu, Ninox scutulata), also known as the brown hawk-owl

Short-eared owl 
(Cú lửa, Asio flammeus)

The short-eared owl (Asio flammeus) is a widespread grassland species in the family Strigidae.
The bird is found on all continents except Antarctica and Australia, and it is partially migratory.

The name Strigiformes is formed from "Strig", the plural form of the Latin word "strix", meaning "owl", and "formes", meaning "forms".

Strigidae: derived from "Strix", a Latin word for owl (also the same in Greek).

The genus name Asio is from asiō, the Latin name used by Pliny the Younger for a type of horned owl, the feather tufts on the head of these owls give the appearance of "ears" which is a defining characteristic. The possible origin is from ancient Greek οὖς (pronounced roughly as oos) is a noun meaning "ear".

Flammeus is a Latin adjective meaning "flaming," "fiery," or "fiery red," derived from the Latin word flamma (flame).

The true owls or typical owls (family Strigidae) are one of the two generally accepted families of owls, the other being the barn owls (Tytonidae).

Strigiformes: All Owls are classified as members of this order. 
The name is formed from "Strig", the plural form of the Latin word "strix", meaning "owl", and "formes", meaning "forms".

Strigidae: The family for all Owls except Barn Owls, derived from "Strix", a Latin word for owl (also the same in Greek)

Tytonidae: All barn owls are members of this family. The name is derived from the Greek word "tuto", which means "owl".