Perhaps you should try some spelling variations:
"materiales la reflexion." » "materiales a reflexion.", "materiales los reflexion.", "materiales san reflexion.", "materiales una reflexion."
"materiales en reflexion." » "materiales del reflexion.", "materiales y reflexion.", "materiales una reflexion.", "materiales une reflexion."
"materiales de reflexion." » "materiales una reflexion."

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: (((("materiales la reflexion.") or ("materiales de reflexion."))) or ("materiales en reflexion."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("materiales la reflexion.") OR ("materiales de reflexion."))) OR ("materiales en reflexion.")).
• Removing quotes may allow a broader search: (((( materiales la reflexion. ) or ( materiales de reflexion. ))) or ( materiales en reflexion. )).
• Adding a wildcard symbol may retrieve word variants: (((("materiales la reflexion.") or ("materiales de reflexion."))) or ("materiales en reflexion."))*.