Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicoaaa administration" » "publicaoaaa administration" (Expand Search), "publicooaaa administration" (Expand Search), "publicasoaaa administration" (Expand Search)
"publicoas administracao" » "publicaoas administracao" (Expand Search), "publicooas administracao" (Expand Search), "publicasoas administracao" (Expand Search), "publicas administracao" (Expand Search), "publicos 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 ((("publicoaaa administration") OR ("publicoas administracao"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publicoaaa administration\") OR (\"publicoas administracao\"))))".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicoaaa administration ) OR ( publicoas administracao )))).
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publicoaaa administration") OR ("publicoas administracao"))))*.