Perhaps you should try some spelling variations:
luan nhung » luan chung, luan hung, quan nhung
tieu sach » chieu sach, dien sach, te sach
tang luan » dung luan
anh tang » anh bang, anh dang, anh nang
cong dan » cong san, cong tan, cong dong
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh tang luan nhung ((cong dan) OR (huong dan)) ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - anh tang luan nhung ((cong dan) or (huong dan)) ((toan cau) OR (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - anh tang luan nhung ((cong dan) or (huong dan)) ((toan cau) OR (toan tap))*.