Park authorities said the herd included at least four individuals, although the actual number could be higher based on initial assessments.
The species belongs to Group IB, Vietnam’s highest protection category for rare and endangered wildlife.
Authorities said patrols and monitoring had been strengthened in areas where the animals were detected to ensure their safety.
Forest rangers have also tightened controls on people and vehicles entering the area and removed traps set for illegal hunting.
Officials described the sighting as an encouraging development for biodiversity conservation at Yok Don National Park in Dak Lak Province.
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Yok Don National Park covers more than 115,000 hectares across Dak Lak and Lam Dong provinces and borders Cambodia. The park is known for its high biodiversity, with more than 1,000 plant species and around 650 animal species, including many rare and endangered animals.