Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
thieu xanh » chieu xanh, thien anh, thien danh
luat chung » luan chung, luat thuong, cua chung
chung cong » nhung cong, chong cong, phung cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
van toan » van tuan, van tan, van thanh

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: hoc ((thieu xanh) OR (hieu manh)) - canh trinh luat chung cong ((van toan) OR (tinh toan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - canh trinh luat chung cong ((van toan) or (tinh toan)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - canh trinh luat chung cong ((van toan) or (tinh toan)) ban*.