A father and son have been discovered in the Vietnamese jungle after 40 years. Courtesy VTVTwo

AN 82-year-old man and his 41-year-old son have been found living in a forest in central Vietnam after they went missing during the country's war with the US.

The older man could communicate a little in the Cor ethnic minority language, but his son only knew a few words, an official at Tay Tra commune in Quang Ngai province said.

Ho Van Thanh was last seen running into the woods with his then-infant son Ho Van Lang after a bomb exploded in his home, killing his wife and two other children in 1973, newspaper Dan Tri reported.

They were discovered when two people from a nearby village ventured 40 kilometres into the forest looking for firewood and spotted the two men's tree house. The villagers reported the find to local authorities who recovered the pair on Wednesday.

The two men survived by cultivating forest vegetables and hunting animals. They had no contact with the outside world, the report said.

Photographs showed the younger man with dishevelled hair wearing a loin cloth made from tree bark.

Thanh, who was fighting for North Vietnam when the bomb exploded, left behind another son, Ho Van Tri.

"My father is very weak and the doctors are taking care of him, but my brother's health is fine even though he looks very thin," said Tri, who was six months old when his father fled into the jungle.

Thanh is being treated at a medical centre while his son is being looked after by his nephew, Ho Ven Bien.

"My uncle doesn't understand much of what is said to him, and he doesn't want to eat or even drink water," Bien said.

"He's very sad. He doesn't say anything now," he said.

"We know he wants to escape my house to go back to the forest so we have to keep an eye on him now."

Hoang Anh Ngoc, chairman of the district, said local authorities had visited Thanh at the medical centre and given him food.

"I asked officials to keep a close eye on the two men to make sure they don't escape back into the forest," he said.

The discovery has shaken the small community, which thought the two men dead.

"No one could imagine Thanh and his son could live 40 years in isolation in the hard conditions of the jungle," said villager Ho Van Xanh.

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