Perhaps you should try some spelling variations:
"estudios humanisticos serie." » "estudios linguisticos serie.", "estudios humanistica series.", "estudios humanisticos sobre.", "estudios humanisticos en."
"estudios humanos serie." » "estudios urbanos serie.", "estudios peruanos serie.", "estudios ensayos serie.", "estudios humanas serie.", "estudios humanos desde."
"estudios mayo serie." » "estudios maior serie.", "estudios mas serie.", "estudios enzo serie."

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