Perhaps you should try some spelling variations:
"estudis care conflictos sociales" » "estudis care conflitto sociale", "estudis care conflict social", "estudis care condiciones sociales", "estudis care conflicts sociales", "estudis care conflict sociales", "estudis carers conflicts sociales", "estudis care conflictss sociales", "estudis core conflicts sociales", "estudis de conflictos sociales", "estudio para conflictos sociales"
"estudis caso conflictos sociales" » "estudis caso conflitto sociale", "estudis caso conflict social", "estudis caso condiciones sociales", "estudis los conflictos sociales", "estudis case conflict sociales", "estudios luso conflictos sociales"
"estudis care conflicto social" » "estudis care conflict social", "estudis care conflict society", "estudis care conflicts social", "estudis core conflict social", "estudis de conflicto social", "estudio para conflicto social"

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