Perhaps you should try some spelling variations:
"estudios humanos serie." » "estudios urbanos serie.", "estudios peruanos serie.", "estudios humanisticos serie.", "estudios humanas serie.", "estudios humanos desde."
"estudios mazas serie." » "estudios maior serie.", "estudios marcial serie.", "estudios facetas serie.", "estudios humanas serie.", "estudios mezclas serie.", "estudios mazas fermin."
"estudios mas serie." » "estudios a serie.", "estudios maior serie.", "estudios de serie.", "estudios las series.", "estudios mayo serie.", "estudios das series."

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