Perhaps you should try some spelling variations:
"estudio sociolinguistico serie." » "estudio linguistico serie.", "estudios linguisticos serie.", "estudio sociolinguistics spain.", "estudio sociolinguistico de.", "estudio sociolinguistica 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: (("estudio sociolinguistico serie.") or ((("estudios mas serie.") or ("estudios mazas serie."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("estudio sociolinguistico serie.") OR ((("estudios mas serie.") OR ("estudios mazas serie.")))).
• Removing quotes may allow a broader search: (( estudio sociolinguistico serie. ) or ((( estudios mas serie. ) or ( estudios mazas serie. )))).
• Adding a wildcard symbol may retrieve word variants: (("estudio sociolinguistico serie.") or ((("estudios mas serie.") or ("estudios mazas serie."))))*.