Perhaps you should try some spelling variations:
doi chieu » doc hieu, ho chieu, mot chieu
canh manh » lanh manh, canh tranh, cach mang
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
cong luan » tong luan, cong tuan, dong luan
luan phan » luan van, luan hoan
phan lap » phan dau
doi chi » doi khi

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: ((doi chieu) OR (doi chi)) sang - canh manh ((cua thong) OR (cua khong)) cong luan phan lap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doi chi)) sang - canh manh ((cua thong) OR (cua khong)) cong luan phan lap~".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sang - canh manh ((cua thong) OR (cua khong)) cong luan phan lap*.