Perhaps you should try some spelling variations:
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
cong cap » cung cap, cong cac, cong lap
cong cau » cong cu, cong chuc, thong cau
tong ban » trong ban, tuong ban, tong van
ban than » ban thanh, van thanh, ban hang
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) or (chieu sach)) - thanh ((cong cap) or (cong cau)) han tong ban than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chieu sach)) - thanh ((cong cap) OR (cong cau)) han tong ban than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (chieu sach)) - thanh ((cong cap) or (cong cau)) han tong ban than cau*.