Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa
vu khach » vu khanh, vu khac, vay khach
khach ky » hanh ky, thanh ky
hieu van » hieu va, thien van, lieu va
van lam » van nam
toc gia » toc giay, quoc gia, hoc giao
nang o » nang co, nang ho, nang ro
cua tu » cua tuc, cua su, cua cu
o hai » co hai, so hai, o lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ky nang o hai. hieu van lam ((toc gia) OR (tac gia)) ((thanh hai) or (thanh san)) cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang o hai. hieu van lam ((toc gia) OR (tac gia)) ((thanh hai) OR (thanh san)) cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ky nang o hai. hieu van lam ((toc gia) OR (tac gia)) ((thanh hai) or (thanh san)) cua tu".
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang o hai. hieu van lam ((toc gia) OR (tac gia)) ((thanh hai) or (thanh san)) cua tu*.