Module:vi-sortkey/documentation

Alphabetic order: a ă â b c d đ e ê g h i k l m n o ô ơ p q r s t u ư v x y.

Order of tonal diacritics: currently a, à, ả, ã, á, ạ; alternative, a, á, à, ả, ã, ạ.

See the discussion in the Beer Parlour.