Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicos administration" (Expand Search)
"publicas administration" » "publicaas administration" (Expand Search), "publicoas administration" (Expand Search), "publicosas administration" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search)
"publicaos administracao" » "publicaaos administracao" (Expand Search), "publicoaos administracao" (Expand Search), "publicosaos administracao" (Expand Search), "publicos administracao" (Expand Search), "publica administracao" (Expand Search), "publico administracao" (Expand Search)

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

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