Perhaps you should try some spelling variations:
"nhung thoi luan van. noi dung uoc mo" » "nhung thi luan van. noi dung uoc mo", "phung thi luan van. noi dung uoc mo", "nhung loi luan van. noi dung uoc mo", "nhung hoi luan van. noi dung uoc mo", "nhung thai luan van. noi dung uoc mo", "nhung thoi luan van. hoc dung uoc mo", "nhung thoi luan van. noi dung hoc mo", "nhung thoi luan van. noi dung coc mo", "nhung thoi luan van. noi dung thuoc mo"
"nhung thoi luan van. noi dung quoc mo" » "nhung thi luan van. noi dung quoc mo", "phung thi luan van. noi dung quoc mo", "nhung loi luan van. noi dung quoc mo", "nhung hoi luan van. noi dung quoc mo", "nhung thai luan van. noi dung quoc mo", "nhung thoi luan van. noi dang quoc mo", "nhung thoi luan van. noi dong quoc mo", "nhung thoi luan van. noi trung quoc mo", "nhung thoi luan van. hoc dung quoc mo", "nhung thoi luan van. noi dung quoc co", "nhung thoi luan van. noi dung quoc lo", "nhung thoi luan van. noi dung quoc o"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung thoi luan van. noi dung uoc mo") OR ("nhung thoi luan van. noi dung quoc mo"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nhung thoi luan van. noi dung uoc mo\") OR (\"nhung thoi luan van. noi dung quoc mo\"))".
• Removing quotes may allow a broader search: (( nhung thoi luan van. noi dung uoc mo ) OR ( nhung thoi luan van. noi dung quoc mo )).
• Adding a wildcard symbol may retrieve word variants: (("nhung thoi luan van. noi dung uoc mo") OR ("nhung thoi luan van. noi dung quoc mo"))*.