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 hang » luan nang, luan han, luan hung
cong dan » cong tan, huong dan, cong dong
cong tac » cong ty
toan cau » 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 - hanh tang luan hang ((cong dan) or (((cong san) or (cong tac)))) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - hanh tang luan hang ((cong dan) OR (((cong san) OR (cong tac)))) toan cau.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh tang luan hang ((cong dan) or (((cong san) or (cong tac)))) toan cau*.