Perhaps you should try some spelling variations:
"proletariado revolution" » "proletariado revolucion", "proletariado evolucion"
"proletarias revolution" » "proletarias revolucion", "proletarias evolucion", "proletaria revolution", "proletarios revolution", "proletariat revolution"
"proletariado revoluciones" » "proletariado revolucion"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("proletariado revolution") OR ("proletariado revoluciones"))) OR ("proletarias revolution"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"proletariado revolution\") OR (\"proletariado revoluciones\"))) OR (\"proletarias revolution\"))".
• Removing quotes may allow a broader search: (((( proletariado revolution ) OR ( proletariado revoluciones ))) OR ( proletarias revolution )).
• Adding a wildcard symbol may retrieve word variants: (((("proletariado revolution") OR ("proletariado revoluciones"))) OR ("proletarias revolution"))*.