The Vietnamese language is being mispronounced (all models)

[entermask]

Self Checks

• I have thoroughly reviewed the project documentation (installation, training, inference) but couldn't find any relevant information that meets my needs. English 中文 日本語 Portuguese (Brazil)
• I have searched for existing issues search for existing issues, including closed ones.
• I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
• [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:）
• Please do not modify this template :) and fill in all the required fields.

1. Is this request related to a challenge you're experiencing? Tell us your story.

Hi team, I'm having trouble with Vietnamese language support. It seems to be the only language underperforming—I've tested 50+ voices and personal clones, but the pronunciation is consistently off. I suspect it might be a model-level issue.

2. What is your suggested solution?

I tried self-hosting and fine-tuning to fix this, but the volume keeps dropping significantly after training. Could you please look into this? The Vietnamese community is quite active and would really benefit from a fix!

3. Additional context or comments

No response

4. Can you help us with this feature?

• I am interested in contributing to this feature.