Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trang » thanh trung, canh tranh, hanh trinh
trang luan » tang luan, tranh luan, trang tuan
hieu manh » chieu xanh, hieu nganh, dieu hanh
dong dang » duong dang, dong bang, dung dang
toan cau » toan ban, toan tap, toan tai
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 ((chieu sach) or (hieu manh)) - hanh trang luan van dong dang ((toan cau) OR (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu manh)) - hanh trang luan van dong dang ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu sach) or (hieu manh)) - hanh trang luan van dong dang ((toan cau) OR (toan cao))".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (hieu manh)) - hanh trang luan van dong dang ((toan cau) OR (toan cao))*.