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 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 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 quan van tai cong nhat luong" » "cong trinh quan van tai cong chat luong", "cong trinh quan van tai cong nhat huong", "cong trinh quan van tai cong nhat thuong", "cong tinh quang van tai cong nhat luong", "cong trinh luat van tai cong nhat luong", "cong trinh han van tai cong nhat luong", "cong trinh quan van tai cong nhan luong", "cong trinh quan van tai cong ha luong", "cong trinh quan van tai cong suat luong", "cong trinh quan va tai cong nhat luong", "cong trinh quan luan tai cong nhat luong", "cong trinh quan doan tai cong nhat luong", "cong trinh quan von tai cong nhat luong", "cong trinh quan van tuan cong nhat 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 quan van tai cong nhat luong"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cong trinh luan van tai cong nhat luong\") OR (\"cong trinh quan van tai cong nhat luong\"))".
• Removing quotes may allow a broader search: (( cong trinh luan van tai cong nhat luong ) OR ( cong trinh quan van tai cong nhat luong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van tai cong nhat luong") OR ("cong trinh quan van tai cong nhat luong"))*.