Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tranh luan » trinh luan, trinh luat, doanh luan
tieu sach » dien sach, te sach, viet sach
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
dan tai » van tai, dan thi, han tai
tai cao » thai cao, tao cao, tai sao

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 luan ((hang cong) or (bang cong)) dan tai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu sach) OR (chieu sach)) - canh tranh luan ((hang cong) OR (bang cong)) dan tai cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sach) OR (chieu sach)) - canh tranh luan ((hang cong) or (bang cong)) dan tai cao".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu sach) OR (chieu sach)) - canh tranh luan ((hang cong) or (bang cong)) dan tai cao*.