Perhaps you should try some spelling variations:
"cong trinh luan van tai cong nhat luong" » "cong trinh luat van tai cong nhat luong", "cong trinh quan van tai cong nhat luong", "cong trinh han 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 ha luong", "cong trinh luan van tai cong suat luong", "cong trinh luan von tai cong nhat luong", "cong trinh luan van tuan cong nhat luong"
"cong trinh luan van tai dung nhan luong" » "cong trinh luat van tai dung nhan luong", "cong trinh quan van tai dung nhan luong", "cong trinh han van tai dung nhan luong", "cong trinh luan van tai dung nhan tuong", "cong trinh luan van tai dung phan luong", "cong trinh luan van tai dung chat luong", "cong trinh luan van tai dung luan luong", "cong trinh luan van trai dung nhan luong", "cong trinh luan van thi dung nhan luong", "cong trinh luan van mai dung nhan luong", "cong trinh luan von tai dung nhan luong", "cong trinh luan van tuan dung nhan 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 tai cong nhat luong") or ("cong trinh luan van tai dung nhan luong"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong trinh luan van tai cong nhat luong") OR ("cong trinh luan van tai dung nhan luong")).
• Removing quotes may allow a broader search: (( cong trinh luan van tai cong nhat luong ) or ( cong trinh luan van tai dung nhan luong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van tai cong nhat luong") or ("cong trinh luan van tai dung nhan luong"))*.