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Black-crowned night-heron 
(Vạc, Nycticorax nycticorax), or black-capped night-heron, commonly shortened to just night-heron

The black-crowned night heron (Nycticorax nycticorax) is a medium-sized heron found throughout a large part of the world, including parts of Europe, Asia, and North and South America.

The name Nycticorax means "night raven" originating from the Ancient Greek: nuktos "night" and korax, "raven". 
the night herons of the genera Nyctanassa and Gorsachius were formerly placed in Nycticorax.

Gorsachius is a genus of Old World night herons typically found near water in forested regions.

1/ Malayan night heron (Cò tôm, vạc rừng, Gorsachius melanolophus), also known as Malaysian night heron and tiger bittern
2/ White-eared night heron (Vạc hoa, Gorsachius magnificus)
other scientific names: Oroanassa magnifica, Nycticorax magnificus

Malayan night heron 
(Cò tôm, vạc rừng, Gorsachius melanolophus), also known as Malaysian night heron and tiger bittern

The Malayan night heron (Gorsachius melanolophus), also known as Malaysian night heron and tiger bittern, is in the heron family Ardeidae and is distributed in southern and eastern Asia.
The bird species is found in India, Sri Lanka, Brunei, Nepal, Bangladesh, Myanmar, Cambodia, Laos, Vietnam, Thailand, Malaysia, Singapore, China, Indonesia, the Philippines, Taiwan and Japan.

Ardeidae, Ardea: the Latin word ardea meaning "heron".
Gorsachius: not clear as to the origin of the word.
Melanolophus is a combination of the Greek words melas (meaning "black") and lophos (meaning "crest"). Therefore, the name literally translates to "black crest" and is used for species with a black crest, such as the Malayan night heron, which is often called Gorsachius melanolophus. 

Nycticorax is a genus of night herons. The name Nycticorax means "night raven" originating from the Ancient Greek: nuktos "night" and korax, "raven". 
the night herons of the genera Nyctanassa and Gorsachius were formerly placed in Nycticorax.

1/ Black-crowned night-heron (Vạc, Nycticorax nycticorax), or black-capped night-heron, commonly shortened to just night-heron