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Asian woolly-necked stork or Asian woollyneck 
(Hạc cổ trắng, Ciconia episcopus)

The Asian woolly-necked stork or Asian woollyneck (Ciconia episcopus) is a species of large wading bird in the stork family Ciconiidae.

Recently, the African and Asian populations are considered to be two different species: the African woolly-necked stork and the Asian woolly-necked stork. This is based purely on geographical isolation,yet there is no morphological or phylogenetic evidence yet to support this split.

Ciconiidae, Ciconia: the Latin word for "stork".
The specific epithet episcopus is Latin for "bishop".

Black stork (Hạc đen, Ciconia nigra)

The black stork (Ciconia nigra) is a large bird in the stork family Ciconiidae.

In the summer, the black stork is found from Eastern Asia (Siberia and northern China) west to Central Europe.
The bird is migratory, wintering in tropical Africa and Asia; some populations are sedentary though.

Ciconiiformes, Ciconiidae comes from Latin Ciconia (stork).
nigra is from the Latin word for "black".

Ciconia is a genus of birds in the stork family Ciconiidae. The genus name is the Latin word for "stork".
English common names for this species include the white-necked stork, white-headed stork, bishop stork and parson-bird. 

1/ Asian woolly-necked stork or Asian woollyneck (Hạc cổ trắng, Ciconia episcopus)
The specific epithet episcopus is Latin for "bishop".
Recently, the African and Asian populations are considered to be two different species: the African woolly-necked stork and the Asian woolly-necked stork. This is based purely on geographical isolation,yet there is no morphological or phylogenetic evidence yet to support this split.

2/ Black stork (Hạc đen, Ciconia nigra)
Ciconia nigra is from the Latin words for "stork" and "black" respectively.

3/ White stork (Hạc trắng, Ciconia ciconia) 

White stork (Hạc trắng, Ciconia ciconia) 

The white stork (Ciconia ciconia) is a large bird in the stork family, Ciconiidae.

Ciconiiformes, Ciconiidae comes from Latin Ciconia (stork).