Perhaps you should try some spelling variations:
"nhung loi luan van. noi dung uoc mo" » "nhung bai luan van. noi dung uoc mo", "nhung bi luan van. noi dung uoc mo", "nhung bo luan van. noi dung uoc mo", "nhung li luan van. noi dung uoc mo", "nhung hoi luan van. noi dung uoc mo", "nhung loi lan van. noi dung uoc mo", "nhung loi luan van. hoc dung uoc mo", "nhung loi luan van. noi dung quoc mo", "nhung loi luan van. noi dung hoc mo", "nhung loi luan van. noi dung coc mo"
"nhung gi luan van. noi dung uoc mo" » "nhung gi luan van. hoc dung uoc mo", "nhung gi luan van. noi dung quoc mo", "nhung gi luan van. noi dung hoc mo", "nhung gi luan van. noi dung coc mo", "nhung bi luan van. noi dung uoc mo", "nhung bai luan van. noi dung uoc mo", "nhung gia luan van. noi dung uoc mo", "nhung li luan van. noi dung uoc mo"

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