Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
luong cong » trong cong, cong cong, tong cong
tieu sach » dien sach, te sach, viet sach
bang luan » tang luan, hang luan, dung luan
dung cong » dung trong
anh bang » anh hoang, anh quang, tinh bang
dan toan » van toan, dan than, manh toan
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: theo ((tieu sach) OR (chieu sach)) - anh bang luan ((luong cong) or (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu sach) OR (chieu sach)) - anh bang luan ((luong cong) OR (dung cong)) dan toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sach) OR (chieu sach)) - anh bang luan ((luong cong) or (dung cong)) dan toan cao*".