@pspvhp: Forget it. The TTS files use a proprietary - and now obsolete (AFAIK) format. So unless you're willing to spend 10+ years getting a degree in linguistics and reverse engineering the entire format, it's just not possible.
IIRC, all the existing language packs are essentially rips from other devices (mostly car navigation systems). Your only chance would be to find an existing vietnamese pack in the correct format.
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