Publicación en Sơn La, Sơn La Province, Vietnam

Basically, I found hostels in Muong Khen, Mai Chau, Moc Chau, Son La, Tuan Giao and Dien Bien Phu. I'm a bit worried, though, because the distances are too high, and google maps (and websites like booking.com) does not give me more options for hotels/hostels/guesthouses. Can you tell me if and where there are more opportunities for accomodation around Son La, so that my rides will be about 50km maximum?