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Bradypterus is a genus of small insectivorous songbirds ("warblers") in the newly recognized grass warbler family (Locustellidae). 

Helopsaltes is a genus of passerine birds in the grassbird family Locustellidae.

Pallas's grasshopper warbler (Helopsaltes certhiola), also known as the rusty-rumped warbler, is an Old World warbler in the grass warbler genus Helopsaltes, the family Locustellidae.

1/ Pallas's grasshopper warbler (Chích đầm lầy lớn, Helopsaltes certhiola)

Locustellidae, Locustella is from Latin and is a diminutive of locusta, "grasshopper".
The genus name Helopsaltes combines the Ancient Greek helos meaning "marshy ground" and psaltis "a chanter".

The grass warblers (Grasshopper Warbler) are small passerine birds belonging to the genus Locustella, now considered the northernmost representatives of a largely Gondwanan family, the Locustellidae.

The genus name Locustella is from Latin and is a diminutive of locusta, "grasshopper".

1/ The lanceolated warbler (Chích đầm lầy nhỏ, Locustella lanceolata)
2/ Chinese Bush-Warbler (Chích ngực hung, Locustella tacsanowskia)
3/ 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.

4/ Russet bush warbler (Chích nâu đỏ, Locustella mandelli)
The scientific name commemorates the Italian naturalist Louis Mandelli.

5/ Dalat bush warbler (Locustella idonea)
Chích nâu đỏ Đà Lạt
also known as Annam Grasshopper-Warbler
Some authorities still consider Dalat bush warbler (Locustella idonea) conspecific with the russet bush warbler. 

6/ Spotted bush warbler (Chích họng vạch, Locustella thoracica)

7/ Baikal bush warbler (Locustella davidi), 
also known as Baikal grasshopper-warbler or David's bush warbler