Perhaps you should try some spelling variations:
thi cong » tai cong, thien cong
nam thuc » nam thuoc, am thuc, nam thu
danh vai » danh sai, danh va, doanh van
va triet » va thiet, va trien, ve triet
te sach » toc sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
va nam » van nam, ha nam, va nay
vai va » mai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((thi thanh) or (thi cong)) cau hoi. hieu va nam thuc va danh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((thi thanh) OR (thi cong)) cau hoi. hieu va nam thuc va danh vai va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ((thi thanh) or (thi cong)) cau hoi. hieu va nam thuc va danh vai va triet*.