Plain-backed sparrow 
(Sẻ bụi vàng, Passer flaveolus), also called the Pegu sparrow or olive-backed sparrow

The plain-backed sparrow (Passer flaveolus), also called the Pegu sparrow or olive-backed sparrow, is a sparrow found in Southeast Asia.
Its range spans from Myanmar to central Vietnam, and south to the western part of Peninsular Malaysia.

The name Passer is the Latin word for "sparrow."
flaveolus: Diminutive of flavus, yellowish.