Black-Throated Bushtit, also known as the black-throated tit or red-headed tit 
(Bạc má đuôi dài, Aegithalos concinnus)

The black-throated bushtit (Aegithalos concinnus), also known as the black-throated tit, is a very small passerine bird in the family Aegithalidae.

Grey-Crowned Tit (Aegithalos Annamensis) found in Da Lat (Central Highlands of Vietnam), which does not have a chestnut-colored cap, remains to be separated from the Black-Throated Bushtit.

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