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)
"publicoaaa administration" » "publicaoaaa administration" (Expand Search), "publicooaaa administration" (Expand Search), "publicasoaaa administration" (Expand Search), "publicoaaa administracao" (Expand Search)
"publicaaaas administration" » "publicaaaaas administration" (Expand Search), "publicoaaaas administration" (Expand Search), "publicasaaaas administration" (Expand Search), "publicaaaas 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 ((("publicoaaa administration") OR ("publicaaaas administration"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publicoaaa administration\") OR (\"publicaaaas administration\"))))*".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicoaaa administration ) OR ( publicaaaas administration ))))*.