Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
duong cong » dung cong, luong cong, duong trong
chua xang » chua nang, chuc nang, chu bang
hanh han » hanh nhan, hanh phan, hanh san
va duong » van duong, va tuong, va huong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
han va » hang va, hanh va, nhan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chua xang) or (chieu sach)) - hanh han va duong cong ((dan toan) OR (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chua xang) OR (chieu sach)) - hanh han va duong cong ((dan toan) OR (dan than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chua xang) or (chieu sach)) - hanh han va duong cong ((dan toan) OR (dan than)) cao".
• Adding a wildcard symbol may retrieve word variants: theo ((chua xang) or (chieu sach)) - hanh han va duong cong ((dan toan) OR (dan than)) cao*.