Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
vat dung » van dung, va dung, viet dung
cong san » cong tac
thai cao » thoai cac, thuat cao, toan cao
tai cao » tao cao, tai sao, tai cac

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 - thanh tung ((vat dung) or (va ung)) cong san ((thai cao) or (tai cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh tung ((vat dung) OR (va ung)) cong san ((thai cao) OR (tai cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh tung ((vat dung) or (va ung)) cong san ((thai cao) or (tai cao))*.