One Saturday at Cuu Thac - Tu Son/Hoa Binh province with non-birder friends. We spotted some of the good birds you saw last week, and some news species.
The most notable of them were 1 Red-billed Scimitar-Babbler, two flocks of Coral-billed Scimitar-Babblers, 1 probable Collared Treepie, and 1 flock of 4-5 Lesser Rufous-headed Parrotbills (seen last summer but not ID with certainty. I don't have the Robson in my head like you so I didn't concentrate on the good features at this time and the confusion with the Greater was possible).
We spent one hour along the stream trying to photograph the White-capped Water Redstart - a gorgeous bird !- and its friends : Plumbeous Water Redstart and Slaty-backed Forktail, the last one not easy at all.
Sebastien Delonglee & friends