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