The Ruc people of Vietnam

Now, due to a very low amount of available information, this will be a relatively short essay.
The Ruc is a tribe that is located in the Country of Laos, which is right next to Vietnam. Something that is strange, but not surpising, about the tribe is that if a man or woman in the tribe is bitten or attacked by an animal, they are believed to be cursed and are banished from the tribe, unable to return for 2 or 3 months. Ancestoral worship is not practised in each home of the tribes, but instead is observed in the house of the Village Cheif. They worship a line of spirits, and spirits of the earth, humans, animals and the forest are believed to be the most powerful. Their language is that commonly used among other Chut tribes (the Ruc being a "branch" of the Chut), and they have no native Ruc language; although they are believed to have had a native language until recently. Unfortunately, that is all I was able to find about the internal interactions of the Ruc tribe.