During the Vietnam War, Ngọ became famous among US soldiers for her propaganda broadcasts on Radio Hanoi. Her scripts were written by the North Vietnamese Army and were intended to frighten and shame the soldiers into leaving their posts. She made three broadcasts a day, reading a list of newly killed or imprisoned Americans, and playing popular US anti-war songs in an effort to incite feelings of nostalgia and homesickness, attempting to persuade US GIs that the US involvement in the Vietnam War was unjust and immoral.[1] US Navy ships and personnel were also targeted in her broadcasts, with Ngọ reading out the names of crew members and saying that they were all going to die.[5] She also received and played recorded messages from Americans who were against the war, saying later that she thought these messages were the most effective of all as "Americans will believe their own people rather than the adversary".[6]