Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicaaa administracao" » "publicaaaa administracao" (Expand Search), "publicoaaa administracao" (Expand Search), "publicasaaa administracao" (Expand Search), "publica administracao" (Expand Search), "publicas administracao" (Expand Search)
"publicoaaaas administration" » "publicaoaaaas administration" (Expand Search), "publicooaaaas administration" (Expand Search), "publicasoaaaas administration" (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 ((("publicaaa administracao") OR ("publicoaaaas administration"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publicaaa administracao\") OR (\"publicoaaaas administration\"))))".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicaaa administracao ) OR ( publicoaaaas administration )))).
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publicaaa administracao") OR ("publicoaaaas administration"))))*.