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Ruff (Calidris pugnax, Rẽ lớn ngực đốm) is a medium-sized wader, Scolopacidae family, Calidris genus.

The bird is a visiting winter bird, uncommonly sighted at the Xuan Thuy National Park.

Saunders's gull or the Chinese black-headed gull (Mòng biển mỏ ngắn, Chroicocephalus saundersi) is a species of gull in the family Laridae. The Saunders's gull is named after the British ornithologist Howard Saunders.

Sharp-tailed Sandpiper (Calidris acuminata, Rẽ đuôi nhọn) is a small wader, Scolopacidae family, Calidris genus.

The bird is a visiting winter bird, uncommonly sighted at the Xuan Thuy National Park.

The slaty-breasted rail (Gallirallus striatus, Gà nước vằn) is a species of rail found in the Indian Subcontinent and Southeast Asia.

Spoon-billed sandpiper (Rẽ mỏ thìa, Calidris pygmeus, Calidris pygmaea), a critically threatened species, is a small wader which breeds in north-eastern Russia and winters in Southeast Asia. The birds are frequently sighted birds at the Xuan Thuy National Park in winter.

Spot-billed duck (Vịt giời, Vịt mỏ đốm, Anas poecilorhyncha) is a large dabbling duck that is a non-migratory breeding duck throughout freshwater wetlands in the Indian subcontinent. The name is derived from the red spot at the base of the bill that is found in the mainland Indian population.

The spot-billed pelican (Pelecanus philippensis) or grey pelican (Bồ nông chân xám, Pelecanus philippensis), is a member of the pelican family.

The spotted dove (Streptopelia chinensis, Cu gáy) is a small and somewhat long-tailed pigeon that is a common resident breeding bird across its native range on the Indian subcontinent and in Southeast Asia.

Spotted Redshank (Choắt chân đỏ, Tringa erythropus) is a wader (shorebird) in the large bird family Scolopacidae.

Thick-Billed Green Pigeon 
(Cu xanh mỏ quặp, Treron curvirostra)

The thick-billed green pigeon is a species of bird in the family Columbidae.

Columbidae, Columba: Latin columba (“dove, pigeon”). Ancient Greek κόλυμβος (kólumbos, “a diver”), from κολυμβάω (kolumbáō, “dive, plunge headlong, swim”).
Pigeon is a French word that derives from the Latin pīpiō, for a "peeping" chick;
Dove is an ultimately Germanic word that refers to the bird's diving flight.
The genus name Treron is from the Ancient Greek trērōn meaning "pigeon" or "dove".
curvirostra is Latin for "curved bill".

Tufted duck (Vịt mào, Aythya fuligula) is a small diving duck found in northern Eurasia. The duck is migratory in most of its range, and overwinters in the milder south and west of Europe, southern Asia and all year in most of the United Kingdom.

Western swamphen 
(Xít, Porphyrio porphyrio)

The western swamphen (Porphyrio porphyrio) is a species of swamphen in the rail family Rallidae, one of the six species once referred to as the purple swamphen. 

Gruiformes, Gruidae: from the Latin word grus meaning "crane".
Rallidae: from rallus new Latin for rail, an aquatic bird.
The genus name Porphyrio is the Latin name for "swamphen", meaning "purple".

The Eurasian whimbrel or common whimbrel (Numenius phaeopus) is a wader in the large family Scolopacidae, the genus Numenius. The whimbrel is a passthrough, winter bird commonly sighted at the Xuan Thuy National Park.

White-breasted waterhen 
(Cuốc ngực trắng, Amaurornis phoenicurus)
The species name phoenicurus is from Ancient Greek phoinix, "red", and -ouros -"tailed".

The white-breasted waterhen (Amaurornis phoenicurus) is a waterbird of the rail and crake family, Rallidae, that is widely distributed across South and Southeast Asia. 

Gruiformes, Gruidae: from the Latin word grus meaning "crane".
Rallidae: from rallus new Latin for rail, an aquatic bird.
Amaurornis: the Greek amauros, meaning "dusky" or "brown", and ornis, meaning "bird".

White-throated kingfisher (Sả đầu nâu, Halcyon smyrnensis) also known as the white-breasted kingfisher is a tree kingfisher, widely distributed in Asia from the Sinai east through the Indian subcontinent to the Philippines.

The Wood Sandpiper (Tringa glareola, Choắt bụng xám) is a small wader in the large family Scolopacidae, sandpiper, Tringa genus. Wood Sandpiper is a pass-through winter bird commonly sighted at the Xuan Thuy National Park.