Perhaps you should try some spelling variations:
"dung thoi luan van. tac trung hoc mot" » "dung thi luan van. tac trung hoc mot", "dung toi luan van. tac trung hoc mot", "dung thuoc luan van. tac trung hoc mot", "dung hoi luan van. tac trung hoc mot", "dung thai luan van. tac trung hoc mot", "dung thoi luan van. trac trung hoc mot", "dung thoi luan van. tai trung hoc mot", "dung thoi luan van. tac trong hoc mot", "dung thoi luan van. tac trung quoc mot", "dung thoi luan van. tac trung hoc moi"
"dung thoi quen vang. tac dung hoc mon" » "dung thi quen vang. tac dung hoc mon", "dung toi quen vang. tac dung hoc mon", "dung thuoc quen vang. tac dung hoc mon", "dung thoi quan van. tac dung hoc mon", "dung thoi que van. tac dung hoc mon", "dung thoi que lang. tac dung hoc mon", "dung thoi quen vang. sach dung hoc mon", "dung thoi quen vang. xay dung hoc mon", "dung thoi quen vang. tin dung hoc mon", "dung thoi quen vang. tac dong hoc mon", "dung thoi quen vang. tac dung thuoc mon", "dung thoi quen vang. tac dung khoa mon", "dung thoi quen vang. tac dung hoc moi", "dung thoi quen vang. tac dung hoc cong", "dung thoi quen vang. tac dung hoc bong"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("dung thoi luan van. tac trung hoc mot") or ("dung thoi quen vang. tac dung hoc mon"))~.
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• Adding a wildcard symbol may retrieve word variants: (("dung thoi luan van. tac trung hoc mot") or ("dung thoi quen vang. tac dung hoc mon"))*.