Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
mot chieu » doi chieu, ho chieu
dung cong » dung trong
cong vinh » cong trinh, trong vinh, cong viec
vinh toan » tinh toan, hinh toan, minh 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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (theo chieu)) sang - ((thanh tung) OR (thanh cong)) va dung cong vinh toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (theo chieu)) sang - ((thanh tung) OR (thanh cong)) va dung cong vinh toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (theo chieu)) sang - ((thanh tung) OR (thanh cong)) va dung cong vinh toan cao*.