A man in the central city of Da Nang found more than 1,000 bullets apparently left from the Vietnam War under his house on Thursday.
Le Quang Liem, 59, said he hired some construction workers to fix a pipe. The workers found boxes containing the bullets around 50 centimeters underground.
Many boxes are still intact, Liem said.
He has been living in the house for 20 years but it was the first time he had discovered bullets.
He handed over the bullets to local police, who then send them to the military.
A police officer said investigation found the bullets were used for service pistols of the US army during the Vietnam War.