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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.

Athene is a genus of owls, containing nine living species, depending on classification. 

1/ Spotted owlet (Hù trán trắng, Athene brama)

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).

Strix is a genus of owls in the typical owl family (Strigidae). Common names are earless owls or wood owls, though they are not the only owls without ear tufts, and "wood owl" is also used for forest-dwelling owls. Neotropical birds in the genus Ciccaba are sometimes included in Strix.

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

1/ Brown wood owl (Hù, Strix leptogrammica)
2/ Tawny owl (Hù nivicon, Cú vàng nâu, Strix aluco), also called the brown owl
3/ Spotted wood owl  (Hù phương đông, Strix seloputo)