Can anyone share the bus schedule from Dong Hoi to Phong Nha? I’m arriving by train at Dong Hoi station in the afternoon and need to catch the next bus. How frequent are the services, and are there multiple operators? Is it better to book in advance or just hop on at the bus stop? Do buses go directly to Phong Nha town center or drop off at the park entrance? Approximate fare and travel time would be very helpful.