Perhaps you should try some spelling variations:
"A Fifty-minute period book" » "A Fifty-minute region book", "A Fifty-minute period blood", "A Fifty-minute period black"
"A Fifty-acute period book" » "A Fifty-late period book", "A Fifty-acute period blood", "A Fifty-acute period black"
a fifty » _ fifty, a fifth

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"A Fifty-minute period book\") OR (\"A Fifty-acute period book\"))".
• Removing quotes may allow a broader search: (( A Fifty-minute period book ) OR ( A Fifty-acute period book )).
• Adding a wildcard symbol may retrieve word variants: (("A Fifty-minute period book") OR ("A Fifty-acute period book"))*.