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https://bugzilla.redhat.com/show_bug.cgi?id=485857
--- Comment #1 from Caius "kaio" Chance cchance@redhat.com 2009-02-22 23:08:56 EDT --- * Vietnamese Vowel Plus Tone Mark Combinations *
"A portion of this block (U+1EA0..U+1EF9) comprises vowel letters of the modern Vietnamese alphabet (quoc ngu) combined with a diacritic mark that denotes the phonemic tone that applies to the syllable. In the modern Vietnamese alphabet, there are 12 vowel letters and 5 tone marks." (The Unicode Consortium, "The Unicode Standard 4.0". Addison Wesley, US, 2003.)