Perhaps you should try some spelling variations:
"chung thi luan van. biet the hien cam xuc" » "chung chi luan van. biet the hien cam xuc", "nhung thi luan van. biet the hien cam xuc", "phuong thi luan van. biet the hien cam xuc", "chung thi lan van. biet the hien cam xuc", "chung thi xuan van. biet the hien cam xuc", "chung thi loan van. biet the hien cam xuc", "chung thi luan van. biet the hien cac xuc", "chung thi luan van. biet the hien cau xuc", "chung thi luan van. biet the hien giam xuc"
"phung thi luan van. biet the hien cam xuc" » "phung thi lan van. biet the hien cam xuc", "phung thi xuan van. biet the hien cam xuc", "phung thi loan van. biet the hien cam xuc", "phung thi luan van. biet the hien cac xuc", "phung thi luan van. biet the hien cau xuc", "phung thi luan van. biet the hien giam xuc", "phuong thi luan van. biet the hien cam xuc", "nhung thi luan van. biet the hien cam xuc", "phong thi luan van. biet the hien cam xuc"

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