Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
tranh vat » trinh vat, tranh va, tranh van
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, mot chieu
vat dung » van dung, va dung, viet dung
dan van » dang van, doan van, tan van
dao van » do van, dang van

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 (doi chieu)) xanh - canh tranh vat dung cong ((dan van) or (dao van)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - canh tranh vat dung cong ((dan van) OR (dao van)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) xanh - canh tranh vat dung cong ((dan van) or (dao van)) ban".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) xanh - canh tranh vat dung cong ((dan van) or (dao van)) ban*.