Perhaps you should try some spelling variations:
"phong thi luan van. biet the hien cam xuc" » "phuong thi luan van. biet the hien cam xuc", "phung thi luan van. biet the hien cam xuc", "phong tri luan van. biet the hien cam xuc", "phong thi lan van. biet the hien cam xuc", "phong thi loan van. biet the hien cam xuc", "phong thi thuan van. biet the hien cam xuc", "phong thi luan van. biet the hien cac xuc", "phong thi luan van. biet the hien cau xuc", "phong thi luan van. biet the hien giam xuc"
"phong thi xuan van. biet the hien cam xuc" » "phuong thi xuan van. biet the hien cam xuc", "phung thi xuan van. biet the hien cam xuc", "phong tri xuan van. biet the hien cam xuc", "phong thi xuan van. biet the hien cac xuc", "phong thi xuan van. biet the hien cau xuc", "phong thi xuan van. biet the hien giam xuc", "phong thi xa van. biet the hien cam xuc", "phong thi lan van. biet the hien cam xuc", "phong thi quan van. biet the hien cam xuc", "phong thi xuan can. biet the hien cam xuc", "phong thi xuan tan. biet the hien cam xuc"

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