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

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