Perhaps you should try some spelling variations:
"series estudios espanoles." » "series estudios espaciales.", "series estudiantes espanoles.", "series escritos espanoles.", "serie estudios espanoles.", "seis estudios espanoles.", "tres estudios espanoles."
"dos estudios criticos." » "dos estudios juridicos.", "los estudios criticos."
"series judios espanoles." » "series cuentos espanoles.", "series los espanoles.", "series judios espana.", "serie medios espanoles.", "erdei judios espanoles."

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: (("dos estudios criticos.") or ((("series estudios espanoles.") OR ("series judios espanoles."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("dos estudios criticos.") OR ((("series estudios espanoles.") OR ("series judios espanoles.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"dos estudios criticos.\") or (((\"series estudios espanoles.\") OR (\"series judios espanoles.\"))))".
• Removing quotes may allow a broader search: (( dos estudios criticos. ) or ((( series estudios espanoles. ) OR ( series judios espanoles. )))).
• Adding a wildcard symbol may retrieve word variants: (("dos estudios criticos.") or ((("series estudios espanoles.") OR ("series judios espanoles."))))*.