Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, canh tinh
trinh van » trinh han, trinh quan, trinh toan
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
hang dau » hang tai

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

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