Perhaps you should try some spelling variations:
"bibliotheca historica romanian 1" » "bibliotheca historica romaniae 1" (Expand Search), "bibliotheca historica rumanien 1" (Expand Search), "bibliothek historica romanian 1" (Expand Search)
"bibliotheca historica rumanien 1935" » "bibliotheca historica romaniae 1935" (Expand Search), "bibliotheca historica rumanien 1925" (Expand Search), "bibliotheca historica rumanien 1938" (Expand Search), "bibliotheca historica rumanien 1918" (Expand Search), "bibliothek historica rumanien 1935" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("bibliotheca historica romanian 1") OR ("bibliotheca historica rumanien 1935"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"bibliotheca historica romanian 1\") OR (\"bibliotheca historica rumanien 1935\"))".
• Removing quotes may allow a broader search: (( bibliotheca historica romanian 1 ) OR ( bibliotheca historica rumanien 1935 )).
• Adding a wildcard symbol may retrieve word variants: (("bibliotheca historica romanian 1") OR ("bibliotheca historica rumanien 1935"))*.