Perhaps you should try some spelling variations:
"cong trinh luan van thi cong nhan duong" » "cong trinh luat van thi cong nhan duong", "cong trinh quan van thi cong nhan duong", "cong trinh toan van thi cong nhan duong", "cong trinh luan van thi cong han duong", "cong trinh luan van thi cong nhan dong", "cong trinh luan van thi cong thanh duong", "cong trinh luan van thi cong nhat duong", "cong trinh luan van thi cong san duong", "cong trinh luan van tai cong nhan duong", "cong trinh luan van thien cong nhan duong", "cong trinh luan dan thi cong nhan duong", "cong trinh luan van thu cong nhan duong"
"cong trinh han van thi cong nhan tuong" » "cong trinh han van thi cong nhan trong", "cong trinh han van thi cong nhan thong", "cong trinh han van thi cong nhan tong", "cong trinh han van thi cong nhat tuong", "cong trinh han van thi cong thanh tuong", "cong trinh han van thi cong san tuong", "cong trinh quan van thi cong nhan tuong", "cong trinh han van tai cong nhan tuong", "cong trinh han van thien cong nhan tuong", "cong trinh han dan thi cong nhan tuong", "cong trinh han van thu cong nhan tuong", "cong trinh phan van thi cong nhan tuong", "cong trinh nhan van thi cong nhan tuong", "cong trinh hanh van thi cong nhan tuong"

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 nhan duong") or ("cong trinh han van thi cong nhan tuong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong trinh luan van thi cong nhan duong") OR ("cong trinh han van thi cong nhan tuong")).
• Removing quotes may allow a broader search: (( cong trinh luan van thi cong nhan duong ) or ( cong trinh han van thi cong nhan tuong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van thi cong nhan duong") or ("cong trinh han van thi cong nhan tuong"))*.