Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
hinh dinh » binh dinh, trinh dinh, hinh anh
hang nong » thang long, han tong
nong tan » cong tan, nong dan, nong san
toan cao » toan tap
toan ban » van ban
dinh va » dinh van, dinh ve, tinh va
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu manh) or (chieu sach)) - hinh dinh va hang nong tan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu manh) OR (chieu sach)) - hinh dinh va hang nong tan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doi ((hieu manh) or (chieu sach)) - hinh dinh va hang nong tan ((toan cao) or (toan ban))*.