Local authorities, SOS volunteer teams and residents resumed their search on October 18 after failing to locate the man overnight.
The man, a resident of Vung Tau Ward, went hiking for exercise shortly after 2 pm on October 17 but failed to return home that evening.
His family alerted authorities and began searching for him. Relatives said he normally returned from his mountain walks within an hour.
Police, volunteer rescuers and residents searched throughout the night without success. The search resumed the following morning, with teams expanding the search area.
Viba Mountain, also known as Lon Mountain, is a popular destination for its natural scenery, cloud views and sunsets. Its roads are frequently used by residents for morning and evening exercise.
