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Podiceps is a genus of birds in the grebe family. 

1/ Black-necked grebe or eared grebe (Le cổ đen, Podiceps nigricollis)

Podicipediformes, Podicipedidae: Latin podex, podicis vent, rear-end; pes foot; podicus of the foot (pes, pedis foot). The name means foot at the rear-end, describing position of the legs.
The genus name Podiceps comes from Latin podicis, "rear-end" and ped, "foot", and is a reference to the placement of a grebe's legs towards the rear of its body.

Grebes are aquatic diving birds in the order Podicipediformes which contains a single family, the Podicipedidae, which includes 22 species in six extant genera.

Podicipediformes, Podicipedidae: Latin podex, podicis vent, rear-end; pes foot; podicus of the foot (pes, pedis foot). The name means foot at the rear-end, describing position of the legs.

Tachybaptus is a genus of small birds of the grebe or Podicipedidae family. The genus name means "quick diving": it is from Ancient Greek takhys "quick" or "fast" and bapto "I dip" or "to sink under".

1/ Little grebe (Le hôi, Tachybaptus ruficollis), also known as dabchick