Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
tang vat » tang van, dang vat, bang vat
vat dung » van dung, va dung, viet dung
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (sua chua)) han - anh tang vat dung cong ((dan toan) OR (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (sua chua)) han - anh tang vat dung cong ((dan toan) OR (dan than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (sua chua)) han - anh tang vat dung cong ((dan toan) OR (dan than)) cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (sua chua)) han - anh tang vat dung cong ((dan toan) OR (dan than)) cao*.