TienThien Tea Investment and Development Joint Stock Company produces specialty fermented teas, notably Thien Shan Tea, made from ancient Snow Shan tea trees in Hoang Su Phi, Ha Giang, Vietnam. Their teas are visibly fermented, with smoky, earthy, and smooth profiles, and are recognized for their quality and unique processing methods. The company also produces other specialty teas such as Bamboo Shan Buds and Thien Red Tea.