OP, have you looked into speaking with a speech language pathologist (SLP)? I know there are Vietnamese SLP's out there, because I see them ever year when I attend the National Stuttering Association yearly convention. OP the following weblink is that of the National Stuttering Associations (https://www.westutter.org) website's page for researching SLP's: https://www.westutter.org/find-speech-therapist Good luck!