
Mouhot's Rolled-Leaf Spider - Poltys mouhoti
From Wikipedia, on the genus Poltys, the species Poltys mouhoti is reported from Vietnam. And it was described back from 1863.
Couldn't find any 'official' reference of this species recorded outside of Vietnam. It wouldn't be a surprise that since it is found in Vietnam, that the same species can also be found in Cambodia, Thailand or even further to Malaysia.
Sightings of similar looking Spider, though not common has been reported from Peninsular, especially from one particular guy who organised herping trip and night macro photography and he identified his sightings to Poltys mouhoti.
I guess the only way one can verify that it is not the same species will be to collect them and conduct scientific study on them and especially with DNA.