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Charadrius is a genus of plovers, a group of wading birds in the family Charadriidae, in the order Charadriiformes. 

1/ Common ringed plover or ringed plover (Charadrius hiaticula)

The two below species are moved to the genus Thinornis.

1/ Long-billed plover (Choi choi lớn, Charadrius placidus)

2/ Little ringed plover (Choi choi nhỏ, Charadrius dubius) 
The specific dubius is Latin for doubtful, since Sonnerat, writing in 1776, thought this bird might be just a variant of common ringed plover.

Charadrius comes from the Ancient Greek kharadrios, meaning a bird found in river valleys or ravines ((kharadra) being ravine), and was later adopted into Late Latin. The Latin word charadrius described a yellowish bird mentioned in the Vulgate Bible.

Common ringed plover or ringed plover 
(Charadrius hiaticula)

The common ringed plover or ringed plover (Charadrius hiaticula) is a species of bird in the family Charadriidae. 
The bid breeds across much of northern Eurasia, as well as Greenland.

Identification:
- leg colour, 
- the head pattern, 
- the lack of an obvious yellow eye-ring.

Charadrius comes from the Ancient Greek kharadrios, meaning a bird found in river valleys or ravines ((kharadra) being ravine), and was later adopted into Late Latin. The Latin word charadrius described a yellowish bird mentioned in the Vulgate Bible.

Hiaticula is a Late Latin word meaning "dweller in a cleft" or "one who lives in a gap". It is formed from the Latin words hiatus ("cleft," "gap," or "opening") and -cola ("dweller" or "inhabiting") referring to a plover.

The little ringed plover (Thinornis dubius) is a small plover of the family Charadriidae. 
The bird is native to the Old World and is a migratory species.

Identification:
- head pattern, 
- leg colour, 
- a clear yellow eye-ring.

Charadrius, Charadriidae or Charadriiformes comes from the Ancient Greek kharadrios, meaning a bird found in river valleys or ravines ((kharadra) being ravine), and was later adopted into Late Latin. The Latin word Thinornis described a yellowish bird mentioned in the Vulgate Bible.

The genus name Thinornis is derived from Ancient Greek: "this" or "thinos" meaning "beach" or "sand," combined with "ornis" meaning "bird". Therefore, Thinornis literally translates to "beach bird" or "sand bird". 

The specific dubius is Latin for doubtful, since Sonnerat, writing in 1776, thought this bird might be just a variant of common ringed plover.

Long-billed plover (Choi choi lớn, Thinornis placidus)
Formerly belonging to the genus Charadrius

The long-billed plover (Thinornis placidus) is a species of wading bird in the family Charadriidae.
The bird can be found in Bangladesh, Bhutan, Brunei, Cambodia, China, Hong Kong, India, Indonesia, Japan, Laos, Malaysia, Mongolia, Myanmar, Nepal, North Korea, Russia, South Korea, Sri Lanka, Taiwan, Thailand, and Vietnam.

Charadrius, Charadriidae or Charadriiformes comes from the Ancient Greek kharadrios, meaning a bird found in river valleys or ravines ((kharadra) being ravine), and was later adopted into Late Latin. The Latin word Thinornis described a yellowish bird mentioned in the Vulgate Bible.

The genus name Thinornis is derived from Ancient Greek: "this" or "thinos" meaning "beach" or "sand," combined with "ornis" meaning "bird". Therefore, Thinornis literally translates to "beach bird" or "sand bird". 

Placidus is a Latin word meaning "gentle," "calm," "mild," "peaceful," or "placid".