Perhaps you should try some spelling variations:
"public administration" » "publico administration" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search), "public administracao" (Expand Search)
"publica administration" » "publicoa administration" (Expand Search), "publicasa administration" (Expand Search), "publicosa administration" (Expand Search), "publica administracao" (Expand Search)
"publicoaaaaoas administration" » "publicooaaaaoas administration" (Expand Search), "publicasoaaaaoas administration" (Expand Search), "publicosoaaaaoas administration" (Expand Search), "publicoaaaaoas 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 ((("publica administration") OR ("publicoaaaaoas administration"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publica administration\") OR (\"publicoaaaaoas administration\"))))".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publica administration ) OR ( publicoaaaaoas administration )))).
• Adding a wildcard symbol may retrieve word variants: (("public administration") OR ((("publica administration") OR ("publicoaaaaoas administration"))))*.