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