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
bang cong » dang cong, bang song, hang cong
trinh da » trinh dan, trinh dao, trinh do
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
da bang » dau bang, da nang, da dang

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 da bang cong ((dan toan) OR (van toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - canh trinh da bang cong ((dan toan) or (van toan)) cau*.