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

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

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