Hoc said that several days ago, he lost a baby goat. Inspecting the surrounding area, he found trails that looked like the trails left by a big boa.
He followed the trails and caught the animal, which was believed to have swallowed his goat.
A trader offered VND8 million ($400) for the boa but Hoc did not sell.
Local people said that boas usually appear on Hong Linh Mountain when the weather is fine, to seek food. Hoc said several months ago he caught two boas, weighing 15kg, over 2m long and 20cm waist each.
Hoc said based on trails, there is still a boa of around 70kg on the mountain.
Boas are listed in Vietnam Red List. People are banned from hunting and breeding boas. This species of boas can be up to 6m long.
Compiled by Mai Lan