Perhaps you should try some spelling variations:
"cong trinh luan van tai cong nhat luong" » "cong trinh quan van tai cong nhat luong", "cong trinh han van tai cong nhat luong", "cong trinh toan van tai cong nhat luong", "cong trinh luan van tai cong chat luong", "cong trinh luan van tai cong nhat huong", "cong trinh luan van tai cong nhat thuong", "cong trinh luan van tai cong nhan luong", "cong trinh luan van tai cong suat luong", "cong trinh luan van tai dang nhat luong", "cong trinh luan von tai cong nhat luong", "cong trinh luan van tuan cong nhat luong"
"cong trinh luat van thien cong ha thuong" » "cong trinh luat van tien cong ha thuong", "cong trinh luat van hien cong ha thuong", "cong trinh luat van chien cong ha thuong", "cong trinh luat van thien cong han thuong", "cong trinh luat van thien cong hai thuong", "cong trinh luat van thien cong va thuong", "cong trinh luat dan thien cong ha thuong", "cong trinh luat va thien cong ha thuong", "cong trinh luat ban thien cong ha thuong", "cong trinh luat van thien cong hoa thuong", "cong trinh luat van thien dong ha thuong", "cong trinh luat van thien cong tac thuong"

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