White-winged tern, or white-winged black tern 
(Nhàn xám, Chlidonias leucopterus or Chlidonias leucoptera)

The white-winged tern or white-winged black tern (Chlidonias leucopterus) is a species of tern in the family Laridae.
This bird is found in or near bodies of fresh water across much of the world, including Europe, Africa, Asia, and Australia.

Charadriiformes, Charadriidae, Charadrius: Late Latin word for a yellowish bird mentioned in the fourth-century Vulgate; from Ancient Greek kharadrios a bird found in ravines and river valleys (kharadra, "ravine").

Laridae:from Ancient Greek laros or Latin larus, which appears to have referred to a gull or other large seabird.

The genus name Chlidonias is from Ancient Greek khelidonios, "swallow-like", from khelidon, "swallow".

Leucoptera is derived from Ancient Greek meaning "white-winged": the Greek words leukos ("white") and pteron ("wing" or "feather").