Perhaps you should try some spelling variations:
"cong trinh luan van thu cong nhat luong" » "cong trinh luat van thu cong nhat luong", "cong trinh quan van thu cong nhat luong", "cong trinh han van thu cong nhat luong", "cong trinh luan van thu cong chat luong", "cong trinh luan van thu cong nhat huong", "cong trinh luan van thu cong nhat thuong", "cong trinh luan van thu cong nhan luong", "cong trinh luan van thu cong suat luong", "cong trinh luan van thu dang nhat luong"
"cong trinh luan van tai cong ha huong" » "cong trinh luat van tai cong ha huong", "cong trinh quan van tai cong ha huong", "cong trinh han van tai cong ha huong", "cong trinh luan van tai cong ha phuong", "cong trinh luan van tai cong va huong", "cong trinh luan van tai cong ga huong", "cong trinh luan von tai cong ha huong", "cong trinh luan van tuan cong ha huong", "cong trinh luan van tai cong hoa huong", "cong trinh luan van tai dong ha huong", "cong trinh luan van tai cong tac huong"

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