During the question and answer round the judging panel gave her one minute to talk about leftover food.
In her answer, Huyen Dieu said in order to reduce food waste people should not take excessive amounts of food, explaining that leftovers people throw away contribute to hurting the environment and warming up the planet.
Her answer received a rousing round of applause from both judges and members of the audience, a decisive factor that helped her secure the title.
The first runner-up went to a contestant from the Philippines, while the second, third, and fourth runners-up titles went to contestants from the United States, Belgium, and Egypt, respectively.
Miss Eco Teen International is an international beauty contest that aims to empower youth, create greater self-awareness, and make an impact, through the theme of protecting the environment.
The event brings together teens from all over the world, with a primary goal of selecting the next Teen Queen to represent teenagers worldwide, while also promoting environmental responsibility.