Perhaps you should try some spelling variations:
"estudis de conflicto social" » "estudis de conflict social", "estudis de conflict society", "estudis del conflicto social", "estudis de conflictos social", "estudis de conflit social", "estudios de conflicto social", "estudio de conflicto social", "estudos de conflicto social"
"estudis care conflicts social" » "estudis care conflict social", "estudis care conflicts special", "estudis care conflictos sociales", "estudis carers conflicts social", "estudis cache conflicts social", "estudio para conflicts social"
"estudis scale conflicts social" » "estudis scale conflict social", "estudis scale conflicts special", "estudis scale conflictos sociales", "estudis state conflicts social", "estudis value conflicts social", "estudis local conflicts social", "studies scale conflicts social", "study scale conflicts social", "estudios sociales conflicts social"

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