Black-crested Bulbul 
(Rubigula flaviventris, Chào mào vàng mào đen)

The black-crested bulbul is a member of the bulbul family Pycnonotidae of passerine birds.

Pycnonotidae
pycno-
 Pycnonotus
 puknos "thick" or "compact" and 
 -nōtos "-backed".
Rubigula: combines the Medieval Latin rubinus meaning "ruby" with Latin gula meaning "throat".
flaviventris: New Latin; from flāvus (“yellow”) +‎ venter (“belly”).