Perhaps you should try some spelling variations:
doi chiet » doi chi, doi viet, doi chinh
doi chieu » doc hieu, doi chi, ho chieu
tranh qua » tranh cua, thanh qua, trinh qua
qua trinh » qua kinh
quang cao » nang cao, quang nam
dung van » duong van, dung va, dang van
tuan cao » toan cao, juan cao, thuan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chiet) or (doi chieu)) tach - canh tranh qua trinh dung van ((tuan cao) OR (quang cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chiet) OR (doi chieu)) tach - canh tranh qua trinh dung van ((tuan cao) OR (quang cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chiet) or (doi chieu)) tach - canh tranh qua trinh dung van ((tuan cao) OR (quang cao))".
• Adding a wildcard symbol may retrieve word variants: ((doi chiet) or (doi chieu)) tach - canh tranh qua trinh dung van ((tuan cao) OR (quang cao))*.