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- There are a great many marks to differentiate between vowels, but not all the vowels have them. And yes, there are tone marks, but there's one tone that isn't marked.Chuck Entz (talk) 14:04, 15 August 2012 (UTC)
- The are 21 Google Books hits for suy hao , of which 5 are accidental juxtapositions of other forms of suy or hao. That leaves 16 examples in running Vietnamese speech without the accents. I would say the spelling is citeable. I don't speak Vietnamese, so I can't tell if they support the definition, though. I haven't checked usenet. Chuck Entz (talk) 14:20, 15 August 2012 (UTC)