Perhaps you should try some spelling variations:
bibliotheca prehistorica » biblioteca praehistorica, biblioteca historica, biblioteca historia
"Bibliotheca prehistorica espana ;" » "Bibliotheca prehistoria espana ;", "Bibliotheca prehistoricos espana ;", "Bibliotheca historia espana ;"
"bibliotheca praehistorica hispana ;" » "bibliotheca prehistoria hispana ;", "bibliotheca prehistoric hispana ;"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("bibliotheca praehistorica hispana ;") or ("Bibliotheca prehistorica espana ;"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bibliotheca praehistorica hispana ;") OR ("Bibliotheca prehistorica espana ;")).
• Removing quotes may allow a broader search: (( bibliotheca praehistorica hispana ; ) or ( Bibliotheca prehistorica espana ; )).
• Adding a wildcard symbol may retrieve word variants: (("bibliotheca praehistorica hispana ;") or ("Bibliotheca prehistorica espana ;"))*.