Flycatcher warblers are small insectivorous passerine birds belonging to the genus Seicercus, family Phylloscopidae (formerly Old World warbler family). 

Seicercus: Greek seio to shake; kerkos tail. 

1/ (Chích, Seicercus burkii) - Yellow-eyed flycatcher warbler (nemoralis, Phylloscopus whistleri nemoralis): 
Nepal to southwestern China, Myanmar and nothern Thailand
Some confusion with Whistler's warbler (Phylloscopus whistleri)? 
Whistler's warbler was previously placed in the genus Seicercus. 
A molecular phylogenetic study published in 2018 found that neither Phylloscopus nor Seicercus were monophyletic. In the subsequent reorganization the two genera were merged into Phylloscopus which has priority under the rules of the International Commission on Zoological Nomenclature.

2/ (Chích đớp ruồi đầu xám, Seicercus valentini)
3/ Chestnut-headed Flycatcher Warbler (Chích đớp ruồi đầu hung, Seicercus castaniceps or Phylloscopus castaniceps)
4/ Plain-tailed warbler or Alström's warbler (Chích đớp ruồi đuôi phẳng, Seicercus soror, Phylloscopus soror)
5/ Grey-cheeked Flycatcher Warbler (Chích đớp ruồi má xám, Seicercus poliogenys)
6/ White-spectacled Flycatcher Warbler (Chích đớp ruồi mày đen, Seicercus affinis or Phylloscopus intermedius)