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Anous, commonly known as the noddies, is a genus of seabirds in family Laridae.
Anous is Ancient Greek for "stupid" or "foolish", referring to the birds' unwariness or indifference to hunters, predators.

1/  Brown noddy or common noddy (Nhàn đầu xám, Anous stolidus)

Chlidonias, often known as the marsh terns, is a genus of birds in family Laridae. 
The birds are found in freshwater marshes, rather than coastal locations. 
The genus name Chlidonias is from Ancient Greek khelidonios, "swallow-like", from khelidon, "swallow".

1/ Whiskered tern (Nhàn đen, Chlidonias hybrida)
The specific hybridus is Latin for hybrid.

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

Chroicocephalus is a genus of medium to relatively small gulls which were included in the genus Larus earlier.
The genus name Chroicocephalus is from Ancient Greek khroizo, "to colour", and kephale, "head".

1/ Black-headed gull (Chroicocephalus ridibundus)
The specific ridibundus is Latin for "abundant".

2/ Brown-headed gull (Mòng bể đầu nâu, Chroicocephalus brunnicephalus)

Gelochelidon is a genus of terns in the bird family Laridae.
The name combines the Ancient Greek gelao meaning "to laugh" with khelidon meaning "swallow".

1/ Gull-billed tern (Nhàn chân đen, Gelochelidon nilotica), formerly Sterna nilotica
formerly placed in the genus Sterna.
The specific epithet nilotica is from Latin niloticus meaning "of the River Nile".

Gygis is a genus of white terns in the family Laridae.

1/ White tern or common white tern (Nhàn trắng, Gygis alba), sometimes known as the fairy tern, angel tern and white noddy
The name Gygis is from the Ancient Greek guges for a mythical bird and the specific alba is Latin for "white"

Hydroprogne is a genus of terns in the bird family Laridae.
The genus name is from Ancient Greek hudros, "water", and Latin progne, "swallow".

1/ Caspian tern (Nhàn Caxpia, Hydroprogne caspia)
The specific caspia is from Latin and, like the English name, refers to the Caspian Sea.

Ichthyaetus is a genus of gulls. The genus name is from Ancient Greek ikhthus, "fish", and aetos, "eagle". They were previously included in the genus Larus.

1/ Pallas's gull (Mòng bể đầu đen lớn, Ichthyaetus ichthyaetus), also known as the great black-headed gull
earlier placed in the genus Larus.

2/ Relict gull or Central Asian gull (Mòng bể relic, Ichthyaetus relictus)

Laridae is a family of birds that comprises the gulls, terns, noddies, skimmers, and kittiwakes of the order Charadriiformes.

Larus is a large genus of gulls with worldwide distribution (by far the greatest species diversity is in the Northern Hemisphere).
The genus name is from Ancient Greek laros or Latin larus, which appears to have referred to a gull or other large seabird.

1/ European herring gull (Mòng bể chân vàng, Larus argentatus)
2/ Common gull or sea mew (Mòng bể đầu trắng, Larus canus)
3/ Black-tailed gull (Mòng bể đuôi đen, Larus crassirostris) 

Onychoprion, the "brown-backed terns", is a genus of seabirds in the family Laridae. 
The genus name is from Ancient Greek onux, "claw" or "nail", and prion, "saw".

1/ Bridled tern (Nhàn lưng đen, Onychoprion anaethetus)
The specific anaethetus means "senseless, stupid".

2/ Sooty tern (Nhàn nâu, Onychoprion fuscatus), coloquially wideawake tern or just wideawake
The specific fuscatus is Latin for "dark".

The genus Rynchops, which are commonly known as skimmers, are tern-like birds in the family Laridae of the order Charadriiformes.
Some authorities place the genus Runchops in a separate family Rynchopidae (Ho Xuc Ca).
The genus name Rynchops is from the Ancient Greek rhunkhos meaning "bill" and kopto meaning "to cut off".

1/ Indian skimmer or Indian scissors-bill (Xúc cá, Rynchops albicollis)

Saundersilarus is genus of gulls in the family Laridae. 

1/ Saunders's gull (Mòng bể mỏ ngắn, Saundersilarus saundersi) or the Chinese black-headed gull
earlier placed in the genus Larus.
The Saunders's gull is named after the British ornithologist Howard Saunders.

Sterna is a genus of terns in the bird family Laridae.
Sterna is derived from Old English "stearn" which appears in the poem The Seafarer (1000 years after C.E).

1/ Common tern (Nhàn, Sterna hirundo) 
The Latin for swallow is hirundo, and refers here to the tern's superficial likeness to that unrelated bird, which has a similar light build and long forked tail. This leads to the informal name "sea swallow".

2/ Black-bellied tern (Nhàn bụng đen, Sterna acuticauda)

3/ Roseate tern (Nhàn hồng, Sterna dougallii)

4/ Black-naped tern (Nhàn Xumatra, Sterna sumatrana)

Sternula is a genus of small white terns in the family Laridae.
The genus name is a diminutive of Sterna, "tern".

1/ Little tern (Nhàn nhỏ, Sternula albifrons)
The specific albifrons is from Latin albus, 'white', and frons, 'forehead'.

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.