Perhaps you should try some spelling variations:
"materials / escola administracion publica de catalunya ; 7" » "materials / escola administracion local de catalunya ; 7" (Expand Search), "materials / escoi administracio publica de catalunya ; 7" (Expand Search)
"materials / la administracion publica de catalunya ; 7" » "materials / la administracion local de catalunya ; 7" (Expand Search), "materials / i administracio publica de catalunya ; 7" (Expand Search)
"materials / escola administracio publica de catalunya ; 7" » "materials / escola administracio 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 / la administracion publica de catalunya ; 7"))) OR ("materials / escola administracio publica 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 / la administracion publica de catalunya ; 7\"))) OR (\"materials / escola administracio publica de catalunya ; 7\"))".
• Removing quotes may allow a broader search: (((( materials / escola administracion publica de catalunya ; 7 ) OR ( materials / la administracion publica de catalunya ; 7 ))) OR ( materials / escola administracio publica de catalunya ; 7 )).
• Adding a wildcard symbol may retrieve word variants: (((("materials / escola administracion publica de catalunya ; 7") OR ("materials / la administracion publica de catalunya ; 7"))) OR ("materials / escola administracio publica de catalunya ; 7"))*.