Perhaps you should try some spelling variations:
"estudios humanisticos serie." » "estudios linguisticos serie.", "estudios humanistica series.", "estudios humanisticos sobre.", "estudios humanisticos en."
"estudios americanos joan." » "estudios latinoamericanos joan.", "estudios americanos han.", "estudios americanos en.", "estudios americanos a.", "estudios emericanos joan.", "estudios dmericanos joan.", "estudios _mericanos joan."
"estudios a series." » "estudios e series.", "estudios d series.", "estudios _ series.", "estudios y series.", "estudios a serie.", "estudios las series."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("estudios americanos joan.") or ("estudios humanisticos serie."))) or ("estudios a series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("estudios americanos joan.") OR ("estudios humanisticos serie."))) OR ("estudios a series.")).
• Removing quotes may allow a broader search: (((( estudios americanos joan. ) or ( estudios humanisticos serie. ))) or ( estudios a series. )).
• Adding a wildcard symbol may retrieve word variants: (((("estudios americanos joan.") or ("estudios humanisticos serie."))) or ("estudios a series."))*.