Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
ban tuong » ban huong, ban trong, va tuong
van luong » van duong, van cuong, nang luong
cong lap » cong luan, cong lang, cong tac
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh cong lap ((ban tuong) OR (van luong)) dan chan cau~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh cong lap ((ban tuong) or (van luong)) dan chan cau*.