Perhaps you should try some spelling variations:
"slave revolt" » "llave revolt", "suave revolt", "lave revolt", "slave revolte", "slave revol", "slave revolu"
"clave revolta" » "clave revoltea", "clave revola", "clave revolua", "clave rivolta", "clave revuelta", "clave travolta"
"save revole" » "save revolte", "save revele", "save revale"
"clave revolucao" » "clave revolucion"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("slave revolt") OR ("save revole"))) OR ((("clave revolta") OR ("clave revolucao"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"slave revolt\") OR (\"save revole\"))) OR (((\"clave revolta\") OR (\"clave revolucao\"))))*".
• Removing quotes may allow a broader search: (((( slave revolt ) OR ( save revole ))) OR ((( clave revolta ) OR ( clave revolucao ))))*.