Perhaps you should try some spelling variations:
"materials / escola administracion publica de catalunya ; 7" » "materials / escola administracio publica de catalunya ; 7" (Expand Search), "materials / la administracion publica de catalunya ; 7" (Expand Search), "materials / la administracionn publica de catalunya ; 7" (Expand Search)
"materials / escola administracion local de catalunya ; 7" » "materials / la administracion local de catalunya ; 7" (Expand Search), "materials / la administracionn local de catalunya ; 7" (Expand Search)
"materials / escola administracio local de catalunya ; 7" » "materials / la administracion local de catalunya ; 7" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("materials / escola administracion publica de catalunya ; 7") OR ((("materials / escola administracion local de catalunya ; 7") OR ("materials / escola administracio local de catalunya ; 7"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"materials / escola administracion publica de catalunya ; 7\") OR (((\"materials / escola administracion local de catalunya ; 7\") OR (\"materials / escola administracio local de catalunya ; 7\"))))".
• Removing quotes may allow a broader search: (( materials / escola administracion publica de catalunya ; 7 ) OR ((( materials / escola administracion local de catalunya ; 7 ) OR ( materials / escola administracio local de catalunya ; 7 )))).
• Adding a wildcard symbol may retrieve word variants: (("materials / escola administracion publica de catalunya ; 7") OR ((("materials / escola administracion local de catalunya ; 7") OR ("materials / escola administracio local de catalunya ; 7"))))*.