Perhaps you should try some spelling variations:
nhanh nang » nhanh lang, nhanh mang, nhanh quang
doi chieu » doc hieu, ho chieu, mot chieu
luan hoan » luan van
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doi chi)) sach - nhanh nang ((quan hoang) or (luan hoan)) cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - nhanh nang ((quan hoang) OR (luan hoan)) cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doi chi)) sach - nhanh nang ((quan hoang) or (luan hoan)) cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doi chi)) sach - nhanh nang ((quan hoang) or (luan hoan)) cong dan than cau*.