Perhaps you should try some spelling variations:
"schriften zur naturhistorischen museums frankfurt" » "schriften des naturhistorischen museums frankfurt" (Expand Search)
"schriften zur historisches museum frankfurt" » "schriften der historischen museum frankfurt" (Expand Search), "schriften der historisch museum frankfurt" (Expand Search)
"schriften den kulturhistorischen museums frankfurt" » "schriften zum kulturhistorischen museums frankfurt" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("schriften den kulturhistorischen museums frankfurt") or ((("schriften zur naturhistorischen museums frankfurt") or ((("schriften zur kulturhistorisches museum frankfurt") OR ("schriften zur historisches museum frankfurt"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("schriften den kulturhistorischen museums frankfurt") OR ((("schriften zur naturhistorischen museums frankfurt") OR ((("schriften zur kulturhistorisches museum frankfurt") OR ("schriften zur historisches museum frankfurt")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"schriften den kulturhistorischen museums frankfurt\") or (((\"schriften zur naturhistorischen museums frankfurt\") or (((\"schriften zur kulturhistorisches museum frankfurt\") OR (\"schriften zur historisches museum frankfurt\"))))))".
• Removing quotes may allow a broader search: (( schriften den kulturhistorischen museums frankfurt ) or ((( schriften zur naturhistorischen museums frankfurt ) or ((( schriften zur kulturhistorisches museum frankfurt ) OR ( schriften zur historisches museum frankfurt )))))).
• Adding a wildcard symbol may retrieve word variants: (("schriften den kulturhistorischen museums frankfurt") or ((("schriften zur naturhistorischen museums frankfurt") or ((("schriften zur kulturhistorisches museum frankfurt") OR ("schriften zur historisches museum frankfurt"))))))*.

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