Perhaps you should try some spelling variations:
"cong trinh luan van thu cong nhat thuong" » "cong trinh luan van thu cong nhat huong", "cong trinh luan van thu cong phan thuong", "cong trinh luan van thu cong luat thuong", "cong trinh quan van thu cong nhat thuong", "cong trinh han van thu cong nhat thuong", "cong trinh toan van thu cong nhat thuong", "cong trinh luan van thu cong nhan thuong", "cong trinh luan van thu cong ha thuong", "cong trinh luan van thu cong suat thuong"
"cong trinh luat van thu cong ham luong" » "cong trinh luat van thu cong hai luong", "cong trinh luat van thu cong chat luong", "cong trinh luat van thu cong hang luong", "cong trinh luat dan thu cong ham luong", "cong trinh luat va thu cong ham luong", "cong trinh luat ban thu cong ham luong", "cong trinh luat van thu cong pham luong", "cong trinh luat van thu cong ha luong"

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 thuong") or ("cong trinh luat van thu cong ham luong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong trinh luan van thu cong nhat thuong") OR ("cong trinh luat van thu cong ham luong")).
• Removing quotes may allow a broader search: (( cong trinh luan van thu cong nhat thuong ) or ( cong trinh luat van thu cong ham luong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van thu cong nhat thuong") or ("cong trinh luat van thu cong ham luong"))*.