HANOI, Dec 3 : Fushan Technology, a subsidiary of Taiwanese electronics manufacturer Foxconn, is seeking a permit to expand production in Vietnam to make Xbox gaming devices and other electronic parts, according to a company document sent to Bac Ninh province's environmental department. The company also plans to increase its phone manufacturing capacity by 30 million units to an annual total of 140 million, and intends to start producing charging devices for smart rings, a finger-worn wearable