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Black-winged cuckooshrike 
(Phường chèo xám, Lalage melaschistos), also known as lesser grey cuckooshrike or dark grey cuckooshrike

The black-winged cuckooshrike (Lalage melaschistos), also known as lesser grey cuckooshrike or dark grey cuckooshrike, is a species of cuckooshrike found in South to Southeast Asia.

The genus name is from Ancient Greek lagages, an unidentified bird mentioned by the Greek lexicographer Hesychius of Alexandria.
melaschistos Greek melas black; Late Latin schistus slate (> Latin lapis schistos fissile stone > schistos split).

Indochinese Cuckooshrike 
(Phường chèo xám nhỏ, Lalage polioptera)

The Indochinese cuckooshrike (Lalage polioptera) is a species of bird in the family Campephagidae. 

Campephagidae: New Latin, from Campephaga, type genus (from Greek kampē caterpillar + New Latin -phaga) + -idae; 'Phago' is a term used as a prefix in Latin meaning 'Eating' or 'swallowing'. Phago ultimately comes from the Greek phageîn, which means “to eat, devour.”
The genus name is from Ancient Greek lagages, an unidentified bird mentioned by the Greek lexicographer Hesychius of Alexandria.
polioptera / poliopterus: Greek polios pale, grey; -pteros -winged (pteron wing, feather).

Lalage is a genus of passerine birds belonging to the cuckooshrike family Campephagidae, many of which are commonly known as trillers.
The genus name is from Ancient Greek lagages, an unidentified bird mentioned by the Greek lexicographer Hesychius of Alexandria.

1/ Black-winged cuckooshrike (Phường chèo xám, Lalage melaschistos), also known as lesser grey cuckooshrike or dark grey cuckooshrike

2/ Indochinese cuckooshrike (Phường chèo xám nhỏ, Lalage polioptera)