Perhaps you should try some spelling variations:
"estudios humanas serie." » "estudios mas serie.", "estudios humanidades serie."
"estudios las especies." » "estudio las especies.", "estudios mas especies.", "estudios laura especies.", "estudios de especies."
"estudios a especies." » "estudios e especies.", "estudios d especies.", "estudios _ especies.", "estudios y especies.", "estudios de especies.", "estudios en especies."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("estudios humanas serie.") or ((("estudios las especies.") OR ("estudios a especies."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("estudios humanas serie.") OR ((("estudios las especies.") OR ("estudios a especies."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"estudios humanas serie.\") or (((\"estudios las especies.\") OR (\"estudios a especies.\"))))*".
• Removing quotes may allow a broader search: (( estudios humanas serie. ) or ((( estudios las especies. ) OR ( estudios a especies. ))))*.