Perhaps you should try some spelling variations:
"lectura tres ciencies socials ;" » "lectura tres ciencias sociales ;", "lectura tres ciencia social ;", "lectura tres ciencas sociales ;", "lectura les ciencies socials ;", "lectura artes ciencias socials ;", "lectura otras ciencias socials ;", "lectura entre ciencies socials ;", "lectura de ciencies socials ;", "lectura en ciencies socials ;"
"lecturas tras ciencias social ;" » "lecturas tras ciencia social ;", "lecturas tras ciencias sociales ;", "lecturas tras ciencias sociais ;", "lecturas gratas ciencias social ;", "lecturas para ciencias social ;", "lecturas a ciencias social ;", "lecturas otras ciencias social ;", "lecturas temas ciencias social ;", "lecturas las ciencias social ;"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("lecturas tras ciencias social ;") or ("lectura tres ciencies socials ;"))~.
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• Adding a wildcard symbol may retrieve word variants: (("lecturas tras ciencias social ;") or ("lectura tres ciencies socials ;"))*.