Perhaps you should try some spelling variations:
"slaves political public." » "claves politicas public.", "class political public.", "blacks political public.", "slaves politicas publicad.", "slaves politica publicas.", "slaves politico publico."
"serie politicas publicas." » "serie policiaca publicas."
"sobre politica publica." » "sobre politicas publica."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("slaves political public.") OR ((("serie politicas publicas.") OR ("sobre politica publica."))))~.
• Removing quotes may allow a broader search: (( slaves political public. ) or ((( serie politicas publicas. ) or ( sobre politica publica. ))))~.
• Adding a wildcard symbol may retrieve word variants: (("slaves political public.") or ((("serie politicas publicas.") or ("sobre politica publica."))))*.