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

The little grebe (Tachybaptus ruficollis), also known as the dabchick, is a member of the grebe family Podicipedidae of water birds.

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 Tachybaptus means "quick diving": it is from Ancient Greek takhys "quick" or "fast" and bapto "I dip" or "to sink under".
ruficollis in Latin means "red-necked," derived from rufus ("red") and collum ("neck"), -collis necked.