Perhaps you should try some spelling variations:
"estudis de conflicto social" » "estudis de conflict society", "estudis del conflicto social", "estudis de conflictos social", "estudis de conflit social", "estudis de conflito social", "estudis de conflictoso social", "estudis code conflicto social", "estudios de conflicto social", "estudio de conflicto social", "estudos de conflicto social"
"estudis care conflicts social" » "estudis care conflicts special", "estudis care conflictos sociales", "estudis care conflitto sociale", "estudis care conflict social", "estudis carers conflicts social", "estudis scale conflicts social", "estudio para conflicts social"
"estudis de conflict social" » "estudis de conflit social", "estudis de conflictos social", "estudis code conflict social", "estudios de conflict social", "estudio de conflict social", "estudos de conflict social"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("estudis care conflicts social") OR ((("estudis de conflicto social") OR ("estudis de conflict social")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"estudis care conflicts social\") or (((\"estudis de conflicto social\") OR (\"estudis de conflict social\"))))".
• Removing quotes may allow a broader search: (( estudis care conflicts social ) or ((( estudis de conflicto social ) OR ( estudis de conflict social )))).
• Adding a wildcard symbol may retrieve word variants: (("estudis care conflicts social") or ((("estudis de conflicto social") OR ("estudis de conflict social"))))*.