Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
trung va » truong va, trang va, trung ha
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh
tung va » tuong va, dung va, vung va

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