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Greater crested tern 
(Nhàn mào, Thalasseus bergii), also called crested tern or swift tern

The greater crested tern (Thalasseus bergii), also called crested tern, swift tern, or great crested tern, is a tern in the family Laridae.
The bird is found in tropical and warm temperate coastal parts of the Old World from South Africa around the Indian Ocean to the Pacific 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 generic name Thalasseus is derived from the Ancient Greek Thalassa meaning "sea". The term reflects the coastal, sea-fishing habitat of these birds.

The species epithet bergii commemorates Carl Heinrich Bergius, a Prussian pharmacist and botanist who collected the first specimens of this tern near Cape Town.

Lesser crested tern (Nhàn mào nhỏ, Thalasseus bengalensis)

The lesser crested tern (Thalasseus bengalensis) is a tern in the family Laridae.
The bird breeds in subtropical coastal parts of the world mainly from the Red Sea across the Indian Ocean to the western Pacific, and Australia.
Most populations of this species are migratory. 

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 generic name Thalasseus is derived from the Ancient Greek Thalassa meaning "sea". The term reflects the coastal, sea-fishing habitat of these birds.

The specific epithet bengalensis means "of Bengal", the type locality, historically referring to Bangladesh and part of Northeast India.

Thalasseus, the crested terns, is a genus of eight species of terns in the family Laridae.
The generic name is derived from the Ancient Greek Thalassa meaning "sea".

1/ Greater crested tern (Nhàn mào, Thalasseus bergii), also called crested tern or swift tern
 The species epithet bergii commemorates Carl Heinrich Bergius, a Prussian pharmacist and botanist who collected the first specimens of this tern near Cape Town.