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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

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