Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
cua nhung » va nhung
don thanh » dong thanh, den thanh, dan thanh
son thanh » ban thanh, van thanh
hanh ban » thanh ban, hanh san, hanh han
hang ban » hang luan, hang va, hang tai
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: theo tieu sach - ((hanh ban) or (hang ban)) cua nhung ((don thanh) OR (son thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - ((hanh ban) OR (hang ban)) cua nhung ((don thanh) OR (son thanh)) toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - ((hanh ban) or (hang ban)) cua nhung ((don thanh) OR (son thanh)) toan cau*".