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