Eastern crowned warbler 
or Temminck's Crowned Willow Warbler 
(Chích mào phương Đông, Phylloscopus coronatus)

The eastern crowned warbler (Phylloscopus coronatus) is a species of Old World warbler in the family Phylloscopidae.
The bird inhabits boreal and temperate forests in the east Palearctic.

The eastern crowned warbler breeds in eastern Siberia from the Argun River eastwards and southwards into western Manchuria and into central Sichuan, the Korean Peninsula and Japan. This bird winters in south-east Asia from eastern India and Bangladesh to Java.

Leaf warblers were formerly included in the Old World warbler family but are now considered to belong to the family Phylloscopidae, introduced in 2006.
The name Phylloscopus combines the Ancient Greek phullon meaning "leaf" and skopos meaning "seeker" (from skopeo, "to watch").
coronatus, coronata: Latin meaning "crowned".