Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
hung cuong » hung vuong, hong cuong, hung luong
hanh tran » hanh trang, thanh tran, hanh tram
cuong dan » cuong danh, huong dan, cong dan
tran van » luan van
van hung » van dung, manh hung, van duong
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 (thien hach)) - hanh tran van hung cuong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - hanh tran van hung cuong dan toan cau*.