Grey-Crowned Tit 
Gray-Crowned Bushtit 
(Aegithalos Annamensis, Bạc má đuôi dài đầu xám)

Grey-Crowned Tit (Aegithalos Annamensis) found in Da Lat (Central Highlands of Vietnam) is considered by some authorities a subspecies of the the black-throated tit or black-throated bushtit (Aegithalos concinnus). 
The former does not have a chestnut-colored cap as the latter.

Aegithalidae: the Ancient Greek word aegithalos for a tit.
concinnus: con +cinnus: neat, elegant, clever; pretty, pleasing.