 He is active on raising awareness about the dangers of bauxite mining in the Central Highlands in Vietnam.He has testified before US Congressional committees on human rights issues, calling on the international community to support democratic reforms in Vietnam.As the number of Internet users reached critical mass in Vietnam and the government ramps up its crackdown on bloggers and digital activists, Viet Tan launched the Internet Freedom Campaign, with Duy being an outspoken advocate for Vietnamese netizens to access the net.