Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
hanh trang » thanh trung, canh tranh, hanh trinh
cong sang » cong san, cong lang, cong vang
sang than » cang thang, dang thanh, sang tao
van dang » van dong, van dung, van nang
than cau » toan cau, phan cau, than cap
va dang » va nang, va lang, da dang

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) OR (thien hach)) - hanh trang ((va dang) OR (van dang)) cong sang than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (thien hach)) - hanh trang ((va dang) or (van dang)) cong sang than cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (thien hach)) - hanh trang ((va dang) or (van dang)) cong sang than cau*.