Perhaps you should try some spelling variations:
"nhung hoi luan van. biet the hien cam xuc" » "nhung thoi luan van. biet the hien cam xuc", "nhung loi luan van. biet the hien cam xuc", "nhung doi luan van. biet the hien cam xuc", "nhung hoa luan van. biet the hien cam xuc", "nhung hoc luan van. biet the hien cam xuc", "nhung khoa luan van. biet the hien cam xuc", "nhung hoi luan van. biet the hien cac xuc", "nhung hoi luan van. biet the hien cau xuc", "nhung hoi luan van. biet the hien giam xuc"
"nhung noi luan van. biet the hien cam xuc" » "nhung loi luan van. biet the hien cam xuc", "nhung nguoi luan van. biet the hien cam xuc", "nhung nghi luan van. biet the hien cam xuc", "nhung noi luan van. biet the hien cac xuc", "nhung noi luan van. biet the hien cau xuc", "nhung noi luan van. biet the hien giam xuc", "nhung noi quan van. biet the hien cam xuc", "nhung nuoc luan van. biet the hien cam xuc", "nhung noi quang van. biet the hien cam xuc"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung hoi luan van. biet the hien cam xuc") OR ("nhung noi luan van. biet the hien cam xuc"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nhung hoi luan van. biet the hien cam xuc\") OR (\"nhung noi luan van. biet the hien cam xuc\"))".
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• Adding a wildcard symbol may retrieve word variants: (("nhung hoi luan van. biet the hien cam xuc") OR ("nhung noi luan van. biet the hien cam xuc"))*.