Is it possible to get a bus to Tianshui from Xiahe or Hezuo?

I am afraid that there is no direct bus. You can take a bus to Lanzhou South Bus Station from Xiahe or Hezuo. Then, take bus line 11 to Lanzhou Railway Station. After that, take a bus to TS from the nearby Passenger Transport Center (about 3 hours). The buses are available from 7:20 to 19:30, and the fare is CNY 88. :)