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)
"publicaaa administration" » "publicaaaa administration" (Expand Search), "publicoaaa administration" (Expand Search), "publicasaaa administration" (Expand Search), "publicaaa administracao" (Expand Search), "publica administration" (Expand Search), "publicas administration" (Expand Search)
"publicoaaaas administration" » "publicaoaaaas administration" (Expand Search), "publicooaaaas administration" (Expand Search), "publicasoaaaas administration" (Expand Search), "publicoaaaas 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 ((("publicaaa administration") OR ("publicoaaaas administration"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publicaaa administration\") OR (\"publicoaaaas administration\"))))*".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicaaa administration ) OR ( publicoaaaas administration ))))*.