Perhaps you should try some spelling variations:
"nhung si quyen hanh. tac dung hoc ma" » "nhung si quyen anh. tac dung hoc ma", "nhung si quen hanh. tac dung hoc ma", "nhung si quyet thanh. tac dung hoc ma", "nhung bi quyen hanh. tac dung hoc ma", "nhung gi quyen hanh. tac dung hoc ma", "nhung su quyen hanh. tac dung hoc ma", "nhung khi quyen hanh. tac dung hoc ma", "nhung gia quyen hanh. tac dung hoc ma", "nhung dai quyen hanh. tac dung hoc ma", "nhung si quyen hanh. sach dung hoc ma", "nhung si quyen hanh. xay dung hoc ma", "nhung si quyen hanh. tin dung hoc ma", "nhung si quyen hanh. tac dong hoc ma", "nhung si quyen hanh. tac dung thuoc ma", "nhung si quyen hanh. tac trung hoc ma"
"nhung tri luan van. noi trung quoc mo" » "nhung bai luan van. noi trung quoc mo", "dung tri luan van. noi trung quoc mo", "nhung bi luan van. noi trung quoc mo", "nhung tri luan van. doi trung quoc mo", "nhung tri luan van. nhi trung quoc mo", "nhung tri luan van. hoi trung quoc mo", "nhung tri quan van. noi trung quoc mo", "nhung thi luan van. noi trung quoc mo", "nhung tri tuan van. noi trung quoc mo", "nhung tri luan van. noi trung uoc mo", "nhung tri luan van. noi trung quoc co", "nhung tri luan van. noi trung quoc lo"

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• Adding a wildcard symbol may retrieve word variants: (("nhung si quyen hanh. tac dung hoc ma") or ("nhung tri luan van. noi trung quoc mo"))*.