Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicos administration" (Expand Search), "public administracao" (Expand Search)
"publicas administration" » "publicaas administration" (Expand Search), "publicoas administration" (Expand Search), "publicosas administration" (Expand Search), "publicas administracao" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search)
"publicosaas administration" » "publicaosaas administration" (Expand Search), "publicoosaas administration" (Expand Search), "publicososaas administration" (Expand Search), "publicosaas 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 ("publicas administration"))) OR ("publicosaas administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicas administration\"))) OR (\"publicosaas administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicas administration ))) OR ( publicosaas administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicas administration"))) OR ("publicosaas administration"))*.