Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan cong » luat cong, luong cong, luan chung
cong tan » cong thanh, cong ty, cong ha
cong tac » cong ty
toan ban » van ban

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 - hanh tang luan cong ((cong san) or (((cong tan) or (cong tac)))) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh tang luan cong ((cong san) OR (((cong tan) OR (cong tac)))) toan ban.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh tang luan cong ((cong san) or (((cong tan) or (cong tac)))) toan ban*.