Perhaps you should try some spelling variations:
"cong trinh luan van thi cong khan thuong" » "cong trinh luan van thi cong khanh thuong", "cong trinh luan van thi cong phan thuong", "cong trinh luan van thi cong han thuong", "cong trinh luat van thi cong khan thuong", "cong trinh quan van thi cong khan thuong", "cong trinh toan van thi cong khan thuong", "cong trinh luan van thi cong nhan thuong", "cong trinh luan van tai cong khan thuong", "cong trinh luan van thien cong khan thuong", "cong trinh luan dan thi cong khan thuong", "cong trinh luan van thu cong khan thuong"
"cong trinh han van thi cong khan thuong" » "cong trinh han van thi cong khanh thuong", "cong trinh han van thi cong phan thuong", "cong trinh han van thi cong han thuong", "cong trinh han van thi cong nhan thuong", "cong trinh quan van thi cong khan thuong", "cong trinh han van tai cong khan thuong", "cong trinh han van thien cong khan thuong", "cong trinh han dan thi cong khan thuong", "cong trinh han van thu cong khan thuong", "cong trinh phan van thi cong khan thuong", "cong trinh nhan van thi cong khan thuong", "cong trinh hanh van thi cong khan 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 thi cong khan thuong") OR ("cong trinh han van thi cong khan thuong"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cong trinh luan van thi cong khan thuong\") OR (\"cong trinh han van thi cong khan thuong\"))".
• Removing quotes may allow a broader search: (( cong trinh luan van thi cong khan thuong ) OR ( cong trinh han van thi cong khan thuong )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van thi cong khan thuong") OR ("cong trinh han van thi cong khan thuong"))*.