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

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

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