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

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

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