Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tranh luat » trinh luat, tranh luan, trinh luan
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
bai toan » bai tap
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: ho chieu sach - canh tranh luat ((hang cong) or (dang cong)) bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - canh tranh luat ((hang cong) OR (dang cong)) bai toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - canh tranh luat ((hang cong) or (dang cong)) bai toan cau*.