Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh tranh » canh tranh, hanh trinh, hanh trang
cua phuong » cuu phuong, cuc phuong, luan phuong
hoc thieu » toc thieu, hoc hien
cua khong » hua khong, cua thuong, cua cong
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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 - hanh tranh ((cua khong) or (cua phuong)) cang ((van toan) OR (van tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh tranh ((cua khong) OR (cua phuong)) cang ((van toan) OR (van tuan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh tranh ((cua khong) or (cua phuong)) cang ((van toan) OR (van tuan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh tranh ((cua khong) or (cua phuong)) cang ((van toan) OR (van tuan)) ban*.