Perhaps you should try some spelling variations:
"hardy potter and the philosopher's stone" » "hardy potter and the philosophies's stone", "hardy potter and the philosophy's stone"
"hardy potter and the philosophers's stone" » "hardy potter and the philosophiess's stone", "hardy potter and the philosophys's stone", "hardy potter and the philosophy's stone"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("hardy potter and the philosopher's stone") OR ("hardy potter and the philosophers's stone"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"hardy potter and the philosopher's stone\") OR (\"hardy potter and the philosophers's stone\"))".
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