The calculated distance (air line) between Thanh Hóa and Tuyên Quang is approximately 144 miles respectively 232 kilometers.
By car or train, the actual journey to Tuyên Quang is certainly longer, as only the direct route (as the crow flies) between Thanh Hóa and Tuyên Quang has been calculated here.
Air line (approximately)
232 kilometers
125 nautical miles