USAGE: Stacked diacritics

The "default" Unicode way of combining multiple diacritics on a single
letter puts the diacritics one atop the other so that assuming / is
acute, ^ is circumflex, a-circumflex-acute looks something like:

/
^
a

But in Vietnamese, the acute goes slightly above and slightly next-to
the circumflex, something a bit like

^/
a

(but not quite, the bottom-left of the acute is just above the centre
of the right half of the circumflex).

Perhaps someone here knows ... is there any language apart from
Vietnamese which uses such stacked diacritics, in the default Unicode
way? (I can't think of any, but I don't know every language!). If not,
is there any reason why the default is different from Vietnamese?

(Having gone to a secondary school that had enough Vietnames students
it issued its newsletter in English and Vietnamese, and given that I
work very near to a "Little Vietnam" or "Vietnamtown" or whatever
you'd call it, the Vietnamese approach strikes me as "normal" and
better looking, which is kinda why I ask.)

--
Tristan

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