Perhaps you should try some spelling variations:
hanh tang » hanh trang, anh tang, hanh mang
luan nang » luan van, van nang
thi hieu » thi chieu, thi hien, thi dieu
theo chu » theo chieu, cho chu, chao chu
luan san » luan van, luan hoan, luan phan
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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: ((thi hieu) OR (theo chu)) tinh - hanh tang ((luan nang) OR (luan san)) cong dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thi hieu) or (theo chu)) tinh - hanh tang ((luan nang) OR (luan san)) cong dan than cau~".
• Adding a wildcard symbol may retrieve word variants: ((thi hieu) or (theo chu)) tinh - hanh tang ((luan nang) OR (luan san)) cong dan than cau*.