Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
hang mang » hang hang, hang mong, hanh mang
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 - hang mang ((cua dung) or (cua dong)) cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hang mang ((cua dung) OR (cua dong)) cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hang mang ((cua dung) or (cua dong)) cong dan toan cao*.