The travel restriction was imposed by the Dak Lak Provincial Police, following earlier action against Tien, who was fined VND25 million (US$969) for failing to disclose that her promotional social media posts about the product were sponsored—an apparent breach of advertising regulations.

In Dec. 2024, Tien announced a collaboration with online influencers Pham Quang Linh and Nguyen Thi Thai Hang to launch Kera Supergreens Gummies. On her Facebook account, which boasts over 2.6 million followers, Tien promoted the product, describing it as a convenient and nutritious snack suitable for both children and adults, claiming “a gummy contains a dish’s worth of vegetables.”

However, a consumer later discovered discrepancies between the advertised ingredients and the actual content of the product after taking it to the Quality Assurance and Testing Center 2 for testing. The results revealed that the entire 30-gummy box contained only 0.51 grams of fiber, far less than advertised, leading to public backlash.

In response to the complaints, Tien removed the posts from her Facebook page.

The Ho Chi Minh City Food Safety Department later released the results of a product test for Kera Supergreens Gummies, conducted at the request of the Ministry of Health’s Food Safety Department. The department confirmed that the test results for the gummies showed the levels of sugar, protein, fat, and energy content “were generally consistent with the official Product Self-Declaration.” However, the product’s packaging did not mention fiber content, despite the product being marketed as a fiber supplement.

With this result, authorities ruled out that Kera Supergreens Gummies is a “counterfeit” product.

Tien, Linh, and Hang were subsequently summoned for questioning, where all three admitted to providing inaccurate information about the product. Linh and Hang were each fined VND140 million for the misleading advertising, while Tien issued a public apology.

At 26, Tien made history as the first Vietnamese contestant to win the Miss Grand International title.