Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
thuong dai » thuong mai, truong dai, thuong da
thuong dam » thuong mai, huong dan, truong dai
khung cong » nhung cong, khung long, phung cong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) OR (chieu sang)) - thanh ((thuong dai) or (thuong dam)) khung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - thanh ((thuong dai) OR (thuong dam)) khung cong san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chieu sang)) - thanh ((thuong dai) or (thuong dam)) khung cong san toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chieu sang)) - thanh ((thuong dai) or (thuong dam)) khung cong san toan cao*.