Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
dang thanh » dang hanh, hoang thanh, quang thanh
dong thanh » truong thanh
hieu manh » hieu nganh, dieu hanh, hien hanh
trinh van » trinh han, trinh quan, trinh toan
van nhung » van nhuong, va nhung, van hung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (chieu xanh)) - canh trinh van nhung cong ((dang thanh) OR (dong thanh)) cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - canh trinh van nhung cong ((dang thanh) OR (dong thanh)) cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (chieu xanh)) - canh trinh van nhung cong ((dang thanh) OR (dong thanh)) cac".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu xanh)) - canh trinh van nhung cong ((dang thanh) OR (dong thanh)) cac*.