 In spite of his allegiance to the Communist cause during the war—his pen name, "Vàng Sao", means "Yellow Star", a reference to the national flag—he has been blacklisted since 1972.He had been imprisoned , and his manuscripts have been confiscated .His poems have been translated into English and published in the journals "American Poetry Review" (Vol.28/No.1, Jan/Feb 1999) and "The Literary Review" (Winter 1999).