Olive-backed tailorbird 
(Chích bông nâu, Orthotomus sepium)

The olive-backed tailorbird (Orthotomus sepium) is a species of passerine bird formerly placed in the "Old World warbler" assemblage, it but now placed in the family Cisticolidae.

The name Cisticoladae from Cisticola, which is from Ancient Greek kisthos, "rock-rose", and Latin colere, "to dwell". ... cisticola).
Orthotomus: from the Ancient Greek orthotomeō, meaning 'to cut straight'.
sepium Latin sepium of hedges (sepes hedge).