Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
theo chieu » theo tieu, ho chieu, theo chu
luat cong » thuat cong, luat chung, luat canh
chao chu » cho chu, cua chu, cao cho
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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 (chao chu)) xanh - canh trinh ((luat cong) OR (cua cong)) cong van toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (chao chu)) xanh - canh trinh ((luat cong) OR (cua cong)) cong van toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (chao chu)) xanh - canh trinh ((luat cong) OR (cua cong)) cong van toan cao*.