Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
ho chieu » theo chieu, hoc thieu, doi chieu
cong cac » cuong cac, trong cac, cong chuc
cong cau » cong cu, cong chuc, thong cau
cong tac » cong ty
toan cau » 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: ho chieu sach - thanh ((((cong cac) OR (cong cau))) or (cong tac)) dung cong vang toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh ((((cong cac) OR (cong cau))) OR (cong tac)) dung cong vang toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh ((((cong cac) OR (cong cau))) or (cong tac)) dung cong vang toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh ((((cong cac) OR (cong cau))) or (cong tac)) dung cong vang toan cau*.