Brown bush warbler 
(Chích bụi rậm nâu, Locustella luteoventris )
Formerly placed in the "Old World warbler" assemblage as Bradypterus luteoventrus, it is now placed in the newly recognized family Locustellidae.

The brown bush warbler (Locustella luteoventris) is a songbird species of the family Locustellidae.
The bird is found in Bangladesh, Bhutan, China, Hong Kong, India, Myanmar, Nepal, Thailand, and Vietnam.

The genus name Locustella is from Latin and is a diminutive of locusta, "grasshopper".
luteoventris Latin luteus saffron-yellow; venter, ventris belly.