Perhaps you should try some spelling variations:
"cong trinh luan van thu dung cho ban" » "cong trinh luat van thu dung cho ban", "cong trinh quan van thu dung cho ban", "cong trinh han van thu dung cho ban", "cong trinh luan van thuy dung cho ban", "cong trinh luan van thuc dung cho ban", "cong trinh luan van thu dang cho ban", "cong trinh luan van thu dung co ban", "cong trinh luan van thu dung cho can", "cong trinh luan van thu dung cho san"
"cong trinh luan van thu dung cho bac" » "cong trinh luat van thu dung cho bac", "cong trinh quan van thu dung cho bac", "cong trinh han van thu dung cho bac", "cong trinh luan van thuy dung cho bac", "cong trinh luan van thuc dung cho bac", "cong trinh luan van thu dang cho bac", "cong trinh luan van thu dung cho cac"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("cong trinh luan van thu dung cho ban") OR ("cong trinh luan van thu dung cho bac"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cong trinh luan van thu dung cho ban\") OR (\"cong trinh luan van thu dung cho bac\"))".
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• Adding a wildcard symbol may retrieve word variants: (("cong trinh luan van thu dung cho ban") OR ("cong trinh luan van thu dung cho bac"))*.