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Pond herons (Ardeola) are herons. The scientific name comes from Latin ardeola, a small heron (ardea).

1/ Chinese pond heron (Cò bợ, Ardeola bacchus) 
2/ Javan pond heron (Cò bợ Java, Ardeola speciosa) 

Egretta is a genus of medium-sized herons, mostly breeding in warmer climates.
The genus name comes from the Provençal French for the little egret, aigrette, a diminutive of aigron, "heron".

1/ Pacific reef heron (Cò đen, Egretta sacra), also known as the eastern reef heron or eastern reef egret
2/ Little egret (Cò trắng, Egretta garzetta) 
The species epithet garzetta is from the Italian name for this bird, garzetta or sgarzetta.
3/ Chinese egret or Swinhoe's egret (Cò trắng Trung Quốc, Egretta eulophotes)

Ardea is a genus of herons. The genus name comes from the Latin word ardea meaning "heron".

1/ Great egret (Ardea alba), also known as the common egret, large egret, or (in the Old World) great white egret or great white heron
2/ Intermediate egret, median egret, smaller egret or medium egret (Cò ngàng nhỏ, Ardea intermedia)
Some authorities classify the intermediate egret in its own monotypic genus, Mesophoyx, while others place it with the smaller egrets in Egretta.
3/ Purple heron (Diệc lửa, Ardea purpurea) 
4/ Great-billed heron (Diệc Sumatra, Ardea sumatrana)
5/ Grey heron (Diệc xám, Ardea cinerea)

Butorides is a genus of small herons in the family Ardeidae. Butorides is from Middle English Butor "bittern" and Ancient Greek -oides, "resembling".
It contains three similar species which were formerly considered one species:
-the green heron or green-backed heron, Butorides virescens;
- the lava heron (Butorides sundevalli);
- and the striated heron, Butorides striatus.

1/ Striated heron (Cò xanh, Butorides striata) also known as mangrove heron, little green heron or green-backed heron