Perhaps you should try some spelling variations:
doc chieu » doc hieu, toc thieu, hoc thieu
doi chieu » doc hieu, doi chi, ho chieu
tranh qua » tranh cua, thanh qua, trinh qua
dung cong » dung trong
qua dung » quang dung, su dung, qua song
cong tan » cong tac, cong san, cong thanh
phan dau » phan tu, hang dau

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

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