Perhaps you should try some spelling variations:
"nhung loi luan van. hoc dung uoc mo" » "nhung bai luan van. hoc dung uoc mo", "nhung bi luan van. hoc dung uoc mo", "nhung gi luan van. hoc dung uoc mo", "nhung li luan van. hoc dung uoc mo", "nhung loi lan van. hoc dung uoc mo", "nhung loi nhuan van. hoc dung uoc mo", "nhung loi luan van. hoc ung uoc mo", "nhung loi luan van. hoc dan uoc mo", "nhung loi luan van. tac dung uoc mo", "nhung loi luan van. hoc dung quoc mo", "nhung loi luan van. hoc dung hoc mo", "nhung loi luan van. hoc dung coc mo"
"nhung hoi luan van. hoc dung uoc mo" » "nhung thoi luan van. hoc dung uoc mo", "nhung noi luan van. hoc dung uoc mo", "nhung doi luan van. hoc dung uoc mo", "nhung hoi luan van. hoc ung uoc mo", "nhung hoi luan van. hoc dan uoc mo", "nhung hoi luan van. tac dung uoc mo", "nhung hoi luan van. hoc dung quoc mo", "nhung hoi luan van. hoc dung hoc mo", "nhung hoi luan van. hoc dung coc mo", "nhung hoa luan van. hoc dung uoc mo", "nhung hoc luan van. hoc dung uoc mo", "nhung khoa luan van. hoc dung uoc mo"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung loi luan van. hoc dung uoc mo") OR ("nhung hoi luan van. hoc dung uoc mo"))~.
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• Adding a wildcard symbol may retrieve word variants: (("nhung loi luan van. hoc dung uoc mo") OR ("nhung hoi luan van. hoc dung uoc mo"))*.