The animals, comprising a 1-kg monitor lizard, a 2.5-kg pangolin, a yellow mountain tortoise and a bordered box turtle, had been cared for at the park's Biodiversity Conservation and Ecotourism Centre before being returned to their natural habitat.
Officials said health checks confirmed that all four animals were in good condition, disease-free and capable of surviving in the wild.
The release aims to help conserve endangered species and maintain ecological balance in the area.
Later the same day, authorities in Quang Ngai Province transferred another Sunda pangolin weighing 1.9 kilogrammes to the centre for rehabilitation before its eventual release into the wild.
The species involved are classified among Vietnam's protected and endangered wildlife groups, requiring strict conservation measures.