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The bird genus Apus comprise some of the Old World members of the family Apodidae, commonly known as swifts.
The name Apus is Latin for a swift, thought to be a type of swallow with no feet (from Ancient Greek a meaning "without", and pous meaning "foot").

1/ Little swift (Yến cằm trắng, Apus affinis)

2/ Pacific swift or fork-tailed swift (Yến hông trắng, Apus pacificus)
pacificus refers to the Pacific Ocean.

Cook's swift (Apus cooki)

Cook's swift (Apus cooki) is a small bird in the swift family Apodidae.
Cook's swifts breed in limestone caves of Thailand, Myanmar and Indochina. 

Apodidae, Apus is Latin for a swift, thought to be a type of swallow with no feet (from Ancient Greek a meaning "without", and pous meaning "foot", Greek apous meaning "footless").