Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, theo chu, thi chieu
ho chieu » hoc thieu, doi chieu, mot chieu
trung va » truong va, trang va, trung ha
cong tap » cuong tap, cong tan, tong tap
cong tac » cong ty
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: ((ho chieu) OR (theo chieu)) sang - thanh trung va dung ((cong tap) OR (cong tac)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) sang - thanh trung va dung ((cong tap) OR (cong tac)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) sang - thanh trung va dung ((cong tap) OR (cong tac)) toan cao*.