This is a daily tour Hue - Danang - Hoian running by Hue Tourist Vietnam with minibus, English speaking Tour guide and stop other way: Lang Co Beach, Hai Van Pass, Marble Mountains. For more details please contact Hue Tourist Vietnam.
http://huetouristvietnam.com/Tour-Center-Vietnam/DAILY-BUS-HUE-TO-HOIAN-BY-HAIVAN-PASS.htm