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)
"publicoaaas administration" » "publicaoaaas administration" (Expand Search), "publicooaaas administration" (Expand Search), "publicasoaaas administration" (Expand Search), "publicoaaas 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 ("publicoaaas administration"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publicoaaa administration\") OR (\"publicoaaas administration\"))))*".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicoaaa administration ) OR ( publicoaaas administration ))))*.