Is there any bus, train or plane to liuzhou in guangxi from fenghuang?

Sorry to tell you no direct bus or train or flight us available. You need to take a bus back to Changsha, and then take subway line 2 to Changsha South Railway Station. At last, take a bullet train to Liuzhou. Oh, btw, the bus takes about 6h and CNY140; the subway takes about 30mins and CNY 5; the train takes about 4h 30mins-5h and CNY 227.5 for a second class seat, CNY 305.5 for a first one.