Perhaps you should try some spelling variations:
"estudis care conflictss sociales" » "estudis care conflictos sociales", "estudis care conflicts social", "estudis care conflict social", "estudis care conflicts sociales", "estudis care conflict sociales", "estudis carers conflicts sociales", "estudio para conflictss sociales"
"estudis de conflictss sociales" » "estudis de conflictos sociales", "estudis de conflicts social", "estudis de conflict social", "estudis de conflits sociales", "estudis de conflicto sociales", "estudios de conflictss sociales", "estudio de conflictss sociales", "estudos de conflictss sociales"
"estudis care conflicto social" » "estudis care conflict social", "estudis care conflict society", "estudis care conflicts social", "estudis core conflict social", "estudio para conflicto 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 conflictss sociales") OR ("estudis de conflictss sociales"))) OR ("estudis care conflicto social")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"estudis care conflictss sociales\") OR (\"estudis de conflictss sociales\"))) or (\"estudis care conflicto social\"))".
• Removing quotes may allow a broader search: (((( estudis care conflictss sociales ) OR ( estudis de conflictss sociales ))) or ( estudis care conflicto social )).
• Adding a wildcard symbol may retrieve word variants: (((("estudis care conflictss sociales") OR ("estudis de conflictss sociales"))) or ("estudis care conflicto social"))*.