It looks like you're looking for a related to the movie 27 Dresses (2008), specifically with Vietnamese subtitles (vietsub) — either for downloading, watching, or understanding the plot in depth.
One night, after a disastrous wedding where she catches the bouquet (yet again), Jane meets Kevin in a bar. He’s charming but cynical about love and marriage. They argue about the value of weddings. The next morning, Jane is shocked to discover Kevin is the wedding reporter for a major newspaper, and he begins attending the same weddings she’s in. Jane’s younger sister Tess arrives in town. Beautiful, confident, and selfish, Tess quickly charms George at a charity event. Tess pretends to share George’s passion for environmentalism (even lying about volunteering in Peru). George falls for her, and within weeks, they announce their engagement. 27 dresses vietsub
Heartbroken, Jane agrees to help Tess plan the wedding — and Tess asks Jane to be her maid of honor. Jane reluctantly accepts, adding a 27th dress to her collection. It looks like you're looking for a related
Devastated, Jane decides to sabotage the wedding by reading a personal ad Tess wrote years ago (“Looking for a rich man to take care of me”) — but at the last moment, she can’t go through with it. Instead, she admits her love to George, who gently says he sees her only as a friend. They argue about the value of weddings
But Kevin, who has fallen for Jane, rushes to the wedding. He stops the ceremony by showing everyone his article — not an expose, but a tribute to Jane’s kindness. The final scene is the famous : Jane walks down the aisle (not as a bride, but as herself) wearing all 27 bridesmaid dresses layered on top of each other, finally embracing her unique story.
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