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

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

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