Perhaps you should try some spelling variations:
"cong trinh luan van thu cong nhat duong" » "cong trinh luat van thu cong nhat duong", "cong trinh quan van thu cong nhat duong", "cong trinh han van thu cong nhat duong", "cong trinh luan van thu cong nhat huong", "cong trinh luan van thu cong nhat thuong", "cong trinh luan van thu cong chat luong", "cong trinh luan van thu cong nhan duong", "cong trinh luan van thu cong ha duong", "cong trinh luan van thu cong suat duong"
"cong trinh luan van thien cong nhat duong" » "cong trinh luat van thien cong nhat duong", "cong trinh quan van thien cong nhat duong", "cong trinh han van thien cong nhat duong", "cong trinh luan van thien cong nhat huong", "cong trinh luan van thien cong nhat thuong", "cong trinh luan van thien cong chat luong", "cong trinh luan van thien cong nhan duong", "cong trinh luan van thien cong ha duong", "cong trinh luan van thien cong suat duong", "cong trinh luan van tien cong nhat duong", "cong trinh luan van hien cong nhat duong", "cong trinh luan van chien 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 thu cong nhat duong") or ("cong trinh luan van thien cong nhat duong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong trinh luan van thu cong nhat duong") OR ("cong trinh luan van thien cong nhat duong")).
• Removing quotes may allow a broader search: (( cong trinh luan van thu cong nhat duong ) or ( cong trinh luan van thien cong nhat duong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van thu cong nhat duong") or ("cong trinh luan van thien cong nhat duong"))*.