Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicoa administration" » "publicaoa administration" (Expand Search), "publicooa administration" (Expand Search), "publicasoa administration" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicos administracao" » "publicaos administracao" (Expand Search), "publicoos administracao" (Expand Search), "publicasos administracao" (Expand Search), "publico administracao" (Expand Search), "publicas administracao" (Expand Search), "publica 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 ("publicoa administration"))) OR ("publicos administracao"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicoa administration\"))) OR (\"publicos administracao\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicoa administration ))) OR ( publicos administracao )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicoa administration"))) OR ("publicos administracao"))*.