Perhaps you should try some spelling variations:
"cong trinh luat van thu dung cua ban" » "cong trinh luan van thu dung cua ban", "cong trinh luat dan thu dung cua ban", "cong trinh luat va thu dung cua ban", "cong trinh luat van thuy dung cua ban", "cong trinh luat van thuc dung cua ban", "cong trinh luat van thu dang cua ban", "cong trinh luat van thu dung luan ban"
"cong trinh luat van thu dung cho ban" » "cong trinh luan van thu dung cho ban", "cong trinh luat dan thu dung cho ban", "cong trinh luat va thu dung cho ban", "cong trinh luat van thuy dung cho ban", "cong trinh luat van thuc dung cho ban", "cong trinh luat van thu dang cho ban", "cong trinh luat van thu dung co ban", "cong trinh luat van thu dung cho bac", "cong trinh luat van thu dung cho can"

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 luat van thu dung cua ban") OR ("cong trinh luat van thu dung cho ban"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cong trinh luat van thu dung cua ban\") OR (\"cong trinh luat van thu dung cho ban\"))".
• Removing quotes may allow a broader search: (( cong trinh luat van thu dung cua ban ) OR ( cong trinh luat van thu dung cho ban )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh luat van thu dung cua ban") OR ("cong trinh luat van thu dung cho ban"))*.