Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
doi chieu » doc hieu, doi chi, mot chieu
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, mot chieu
dung xay » dang xay, dung may, dung tay
ban than » ban thanh, van thanh, ban hang
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (ho chieu)) sach - thanh dung xay dung cong ((van tan) or (ban than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) sach - thanh dung xay dung cong ((van tan) OR (ban than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (ho chieu)) sach - thanh dung xay dung cong ((van tan) or (ban than)) cao".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (ho chieu)) sach - thanh dung xay dung cong ((van tan) or (ban than)) cao*.