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

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 ((("proletarios revolution") OR ("proletariat revolution"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"proletariado revolution\") OR (((\"proletarios revolution\") OR (\"proletariat revolution\"))))*".
• Removing quotes may allow a broader search: (( proletariado revolution ) OR ((( proletarios revolution ) OR ( proletariat revolution ))))*.