Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
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
lam tac » lam tai, lam tan, lam sach
hoi cua » hoi chuc
so hoc » mo hoc, so hoa, o hoc
cua tu » cua tuc, cua su, cua cu
o hoi » co hoi, o hoc, o hai
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 khach ky nang ((o hoi) or (((so hoc) or (co hoc)))). hieu van lam tac gia thanh hoi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang ((o hoi) OR (((so hoc) OR (co hoc)))). hieu van lam tac gia thanh hoi cua tu.
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang ((o hoi) or (((so hoc) or (co hoc)))). hieu van lam tac gia thanh hoi cua tu*.