What is the fastest bus route from Da Nang to Bangkok ?

Hi, I'd like to do a bus trip from Danang to Bangkok. Please your advise, which is the fastest bus route for this trip.

Thanks

There is a bus from Da Nang to Savannaket (Laos) just across the border from Thailand.

Last year there were 3 runs each week. As with many things in VN things are never fixed. A friend mentioned they had increased to a daily frequency.

Tickets from Travel Agents.