Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
ban thanh » ban hanh, ban hang
hieu van » thien van, lieu va, hieu ve
su triet » su viet, su tien, ve triet
vu khac » vu kham, vu khanh, bui khac
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
qua ban » cua ban, qua quan
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khac ky nang ma hoi. ((hieu van) or (hieu va)) cau qua ban thanh tai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khac ky nang ma hoi. ((hieu van) OR (hieu va)) cau qua ban thanh tai ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: vu khac ky nang ma hoi. ((hieu van) or (hieu va)) cau qua ban thanh tai ((cua tre) or (su triet))*.