Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicaaaas administration" » "publicaaaaas administration" (Expand Search), "publicoaaaas administration" (Expand Search), "publicasaaaas administration" (Expand Search)
"publicoaa administracao" » "publicaoaa administracao" (Expand Search), "publicooaa administracao" (Expand Search), "publicasoaa administracao" (Expand Search), "publica administracao" (Expand Search), "publico 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 ("publicaaaas administration"))) OR ("publicoaa administracao"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaaaas administration\"))) OR (\"publicoaa administracao\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaaaas administration ))) OR ( publicoaa administracao )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaaaas administration"))) OR ("publicoaa administracao"))*.