Vietnamese marketing and sales copy (vi-VN)

Campaign and outbound copy fails in two directions at once. It fails commercially by reading as a mass mailing — wrong pronoun, translated CTA, formal vocabulary where the market uses loanwords. And it fails legally, because Vietnamese advertising law regulates ordinary marketing enthusiasm: unproven superlatives, discounts over 50%, messages sent outside the legal window, and, from 01/01/2026, undisclosed influencer content.

Both failures are invisible to a fluency check. Every rule below exists to stop a specific one.

Step 1 — The channel picks the register, not the brand

Vietnamese has no neutral "you", and in this skill the choice is made by where the message lands rather than by the brand's usual voice.