Perhaps you should try some spelling variations:
thanh tung » thanh cong
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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

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