Perhaps you should try some spelling variations:
"cong trinh luan van thi cong nhat duong" » "cong trinh quan van thi cong nhat duong", "cong trinh han van thi cong nhat duong", "cong trinh toan van thi cong nhat duong", "cong trinh luan van thi cong nhat huong", "cong trinh luan van thi cong nhat thuong", "cong trinh luan van thi cong chat luong", "cong trinh luan van thi cong nhan duong", "cong trinh luan van thi cong ha duong", "cong trinh luan van thi cong suat duong", "cong trinh luan van tai cong nhat duong", "cong trinh luan van thien cong nhat duong", "cong trinh luan dan thi cong nhat duong", "cong trinh luan van thu cong nhat duong"
"cong trinh luat van thi cong nhat duong" » "cong trinh luat van thi cong nhat huong", "cong trinh luat van thi cong nhat thuong", "cong trinh luat van thi cong chat luong", "cong trinh luat van thi cong nhan duong", "cong trinh luat van thi cong ha duong", "cong trinh luat van thi cong suat duong", "cong trinh luat van tai cong nhat duong", "cong trinh luat van thien cong nhat duong", "cong trinh luat dan thi cong nhat duong", "cong trinh luat va thi cong nhat duong", "cong trinh luat ban thi cong nhat duong", "cong trinh luat van thu cong nhat duong"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("cong trinh luan van thi cong nhat duong") OR ("cong trinh luat van thi cong nhat duong"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cong trinh luan van thi cong nhat duong\") OR (\"cong trinh luat van thi cong nhat duong\"))".
• Removing quotes may allow a broader search: (( cong trinh luan van thi cong nhat duong ) OR ( cong trinh luat van thi cong nhat duong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van thi cong nhat duong") OR ("cong trinh luat van thi cong nhat duong"))*.