Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa
hieu van » hieu va, thien van, lieu va
vu sach » su sach, vu khach
van cam » van nam, van lam, van cau
cam tac » cac tac, cam tay, can tac
nang o » nang co, nang ho, nang ro
cua tu » cua tuc, cua su, cua cu
o hoc » co hoc, mo hoc, so hoc
gia » giao

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

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