Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
quan nhung » qua nhung, cua nhung, luan chung
tieu sach » dien sach, te sach, viet sach
quan hung » quang hung, luan hung, tuan hung
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((tieu sach) OR (chieu sach)) - canh tranh ((quan hung) or (quan nhung)) huong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu sach) OR (chieu sach)) - canh tranh ((quan hung) OR (quan nhung)) huong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sach) OR (chieu sach)) - canh tranh ((quan hung) or (quan nhung)) huong dan than cau".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu sach) OR (chieu sach)) - canh tranh ((quan hung) or (quan nhung)) huong dan than cau*.