Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search), "public administracao" (Expand Search)
"publicosaos administration" » "publicaosaos administration" (Expand Search), "publicasosaos administration" (Expand Search), "publicososaos administration" (Expand Search), "publicosaos administracao" (Expand Search), "publicasaos administration" (Expand Search)
"publico administration" » "publicao administration" (Expand Search), "publicaso administration" (Expand Search), "publicoso administration" (Expand Search), "publico administracao" (Expand Search), "publica administration" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicosaos administration\"))) OR (\"publico administration\"))~".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicosaos administration ))) OR ( publico administration ))~.
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicosaos administration"))) OR ("publico administration"))*.