Beautiful nuthatch 
(Trèo cây lưng đen, Sitta formosa)

The beautiful nuthatch (Sitta formosa) is a bird species in the family Sittidae, collectively known as nuthatches.
The species is found in most of the countries making up the mainland of Southeast Asia.

The nuthatches are all in the genus Sitta, a name derived from sitte, Ancient Greek for this bird.
The English term nuthatch refers to the propensity of some species to wedge a large insect or seed in a crack and hack at it with their strong bills.
formosa: The name derives from the Latin name Formosus and Spanish word "fermoso", meaning "beautiful".