Beside
his job as a lecturer in Vietnam National University (teaching
zoology), he has guided as a birding tour guide for many birdwatcher
from many countries in the world.
At first he guided
with free of charge to merely share his experience and help birdwatchers
who come to Vietnam for the first time and also to improve his
background on ornithology. From the year of 2000 to date, he has
done many surveys of bird and mammal, especially for conservation
projects that supported by NGOs such as Birdlife International,
World Wild Fund for Nature (WWF) and International Crane Foundation
(ICF).
He also is founder
and general manager of WildTour Company, the first and unique
tour organizer concentrating on birding and ecotourism in Vietnam.