Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search), "public administracao" (Expand Search)
"publico administration" » "publicao administration" (Expand Search), "publicaso administration" (Expand Search), "publicoso administration" (Expand Search), "publico administracao" (Expand Search), "publica administration" (Expand Search)
"publicosaaa administration" » "publicaosaaa administration" (Expand Search), "publicasosaaa administration" (Expand Search), "publicososaaa administration" (Expand Search), "publicosaaa administracao" (Expand Search), "publicasaaa 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 ("publico administration"))) OR ("publicosaaa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publico administration\"))) OR (\"publicosaaa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publico administration ))) OR ( publicosaaa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publico administration"))) OR ("publicosaaa administration"))*.