Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu quang » thieu quang, hieu quan, hieu qua
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
anh tang » anh bang, anh dang, anh nang
tang cua » mang cua, hang cua, tang luan
cua dang » cua cong, cua ban
dan toan » van toan, dan than, xuan toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (hieu quang)) - anh tang cua dang cong ((dan toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu quang)) - anh tang cua dang cong ((dan toan) OR (manh toan)) cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (hieu quang)) - anh tang cua dang cong ((dan toan) or (manh toan)) cao*.