Khanh is the first Vietnamese to win the title.
Earlier in the competition, she won a gold medal for Asia & Oceania region in the national costume round and a silver medal in the swimsuit competition.
Born in 1994, the 1.71m tall beauty from Ben Tre province, weighs 51 kg, and measures 90-58-94. She is pursuing a degree in marketing at Curtin University, Singapore. Khanh will graduate in early 2019.
She was the second runner-up at the Miss Sea Vietnam Global 2018 held in Phu Quoc in April this year.
The Miss Earth is an annual international environmental-themed beauty pageant promoting environmental awareness.
