Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hanh tranh » canh tranh, hanh trinh, hanh trang
mot chieu » doi chieu, ho chieu
tong cong » trong cong, cong cong, dung cong
tranh va » tranh van, trang va, trinh va
dan toan » van toan, dan than, manh toan
van quan » van ban
va tong » va thong, va tuong, va trong

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: ((mot chieu) OR (theo chieu)) tinh - hanh tranh va tong cong ((dan toan) OR (van quan)) ban~.
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (theo chieu)) tinh - hanh tranh va tong cong ((dan toan) or (van quan)) ban*.