Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tieu sach » dien sach, te sach, viet sach
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
tang duy » tang du, tang quy, tung duy
duy dung » duc dung, duy hung, duy tung
tan toan » tan tran, tap toan, dan toan
van toan » van tuan, van tan, van thanh

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

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