Perhaps you should try some spelling variations:
tranh qua » tranh cua, thanh qua, trinh qua
dung cong » dung trong
doan dieu » nhan dieu, dang dieu, toan dien
ho chieu » theo chieu, hoc thieu, doi chieu
doc hieu » toc thieu, hoc thieu, hoc hien
qua dung » quang dung, su dung, qua song
cong tan » cong tac, cong san, cong thanh
doan dau » phan dau, doan va, van dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doc hieu)) xanh - canh tranh qua dung cong tan ((doan dau) OR (doan dieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doc hieu)) xanh - canh tranh qua dung cong tan ((doan dau) OR (doan dieu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doc hieu)) xanh - canh tranh qua dung cong tan ((doan dau) OR (doan dieu))".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doc hieu)) xanh - canh tranh qua dung cong tan ((doan dau) OR (doan dieu))*.