Perhaps you should try some spelling variations:
"smaller edition wissenschaft" » "smaller religion wissenschaft", "smaller medizin wissenschaft", "smaller auditiven wissenschaft"
"smaller fiktion wissenschaft" » "smaller sektion wissenschafts", "smaller newton wissenschaft", "smaller diskussion wissenschaft", "smaller division wissenschaft"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"smaller edition wissenschaft\") OR (\"smaller fiktion wissenschaft\"))".
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• Adding a wildcard symbol may retrieve word variants: (("smaller edition wissenschaft") OR ("smaller fiktion wissenschaft"))*.