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