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The black-capped bulbul
 or black-headed yellow bulbul 

The black-capped bulbul (Chào mào vàng chóp đen, Rubigula melanictera) is a member of the bulbul family of passerine birds.
The bird is endemic to Sri Lanka.

The black-capped bulbul was formerly placed in the genus Pycnonotus. 

Compare with the Black Headed Bulbul
Black-capped bulbul has upper half of the head black and lower half yellow, while the black-headed bulbul (Brachypodius melanocephalos) has the whole head black. Both are crestless.

The name Rubigula combines the Medieval Latin rubinus meaning "ruby" with Latin gula meaning "throat".
The specific epithet melanictera combines the Ancient Greek melas meaning "black" with ikteros meaning "jaundice-yellow".

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”).

Rubigula is a genus of Asian passerine birds in the bulbul family, Pycnonotidae.
The name combines the Medieval Latin rubinus meaning "ruby" with Latin gula meaning "throat".
1/ The black-capped bulbul, or black-headed yellow bulbul (Chào mào vàng chóp đen, Rubigula melanictera) is a member of the bulbul family of passerine birds.
The black-capped bulbul was formerly placed in the genus Pycnonotus. Black-capped bulbul has upper half of the head black and lower half yellow, while the black-headed bulbul (Brachypodius melanocephalos) has the whole head black. Both are crestless.

2/ Black-crested bulbul (Rubigula flaviventris, Chào mào vàng mào đen)
flaviventris: New Latin; from flāvus (“yellow”) +‎ venter (“belly”)