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