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)
"publicaas administration" » "publicaaas administration" (Expand Search), "publicoaas administration" (Expand Search), "publicasaas administration" (Expand Search), "publicaas administracao" (Expand Search), "publicas administration" (Expand Search), "publica administration" (Expand Search), "publicos administration" (Expand Search)
"publicoso administration" » "publicaoso administration" (Expand Search), "publicooso administration" (Expand Search), "publicasoso administration" (Expand Search), "publicoso administracao" (Expand Search), "publicos 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 ("publicaas administration"))) OR ("publicoso administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaas administration\"))) OR (\"publicoso administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaas administration ))) OR ( publicoso administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaas administration"))) OR ("publicoso administration"))*.