Vietnamese still uses the same word for both blue and green - xanh
Although they do distinguish by saying 'xanh like the sky' or 'xanh like the trees'.
( Cassius Kray floats like a butterfly, stings like a trout, Mon 18 Jan 2021, 10:06, archived)

Most things are turquoise-ish, then

(dribble, Mon 18 Jan 2021, 10:26, archived)

Weirdly the word for turquoise in Vietnamese, ngọc lam, traslates as "dark blue gemstone"
So they clearly have no fucking idea
( Cassius Kray floats like a butterfly, stings like a trout, Mon 18 Jan 2021, 11:49, archived)