Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
theo chieu » theo tieu, ho chieu, theo chu
thong cong » trong cong, tong cong, thong thong
theo yeu » theo tieu, thiet yeu, theo chu
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
cong van » cong vang, cong san, song van
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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) OR (theo yeu)) xanh - canh trinh va thong cong van ((than cau) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (theo yeu)) xanh - canh trinh va thong cong van ((than cau) OR (than cap))~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo yeu)) xanh - canh trinh va thong cong van ((than cau) OR (than cap))*.