Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicos administration" (Expand Search)
"publicoos administration" » "publicaoos administration" (Expand Search), "publicooos administration" (Expand Search), "publicosoos administration" (Expand Search), "publicos administration" (Expand Search), "publico administration" (Expand Search)
"publicas administracao" » "publicaas administracao" (Expand Search), "publicoas administracao" (Expand Search), "publicosas administracao" (Expand Search), "publica administracao" (Expand Search), "publico administracao" (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 (\"publicoos administration\"))) OR (\"publicas administracao\"))~".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicoos administration ))) OR ( publicas administracao ))~.
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicoos administration"))) OR ("publicas administracao"))*.