Perhaps you should try some spelling variations:
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
manh trung » manh tung, thanh trung, manh hung
trong manh » trong minh, trong anh, trong mach
manh toan » thanh toan, anh tuan, tinh toan
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
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 (chieu sach)) - manh trung ((cua dung) OR (cua dong)) trong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (chieu sach)) - manh trung ((cua dung) OR (cua dong)) trong manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) or (chieu sach)) - manh trung ((cua dung) OR (cua dong)) trong manh toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (chieu sach)) - manh trung ((cua dung) OR (cua dong)) trong manh toan cao*.