Perhaps you should try some spelling variations:
"proletarian revolution" » "proletaria revolution", "proletariat revolution", "proletariado revolution", "proletarian evolucion"
"proletarian revolucion" » "proletaria revolucion", "proletariat revolucion", "proletariado revolucion"
"proletarias revoluciones" » "proletaria revoluciones", "proletarios revoluciones", "proletariat 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 ((("proletarias revoluciones") OR ("proletarian revolucion"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"proletarian revolution\") OR (((\"proletarias revoluciones\") OR (\"proletarian revolucion\"))))".
• Removing quotes may allow a broader search: (( proletarian revolution ) OR ((( proletarias revoluciones ) OR ( proletarian revolucion )))).
• Adding a wildcard symbol may retrieve word variants: (("proletarian revolution") OR ((("proletarias revoluciones") OR ("proletarian revolucion"))))*.