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

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

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