The calculated distance (air line) between Phú Đô and Thái Nguyên is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Thái Nguyên is certainly longer, as only the direct route (as the crow flies) between Phú Đô and Thái Nguyên has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles