Indochinese Fulvetta 
(Fulvetta danisi)
Lách tách ngực nâu, Lách tách Đông Dương

The Indochinese fulvetta (Fulvetta danisi), found in Laos and Vietnam, is a bird species in the family Paradoxornithidae. 

Paradoxornithidae: puzzling, paradox bird; Greek paradoxos extraordinary; ornis bird.
Fulvetta: probably from Latin fulvus: tawny, yellowish-brown.