Perhaps you should try some spelling variations:
"esp{tilde}na relaciones exteriores 1985-." » "esp{tilde}na relaciones exteriores 1970-.", "esp{tilde}la relaciones exteriores 1985-.", "esp{tilde}las relaciones exteriores 1985-.", "esp{tilde}en relaciones exteriores 1985-."
"esp{tilde}de relaciones exteriores 1985-." » "esp{tilde}de relaciones exteriores 1970-.", "esp{tilde}las relaciones exteriores 1985-."

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: (("esp{tilde}na relaciones exteriores 1985-.") OR ("esp{tilde}de relaciones exteriores 1985-."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"esp{tilde}na relaciones exteriores 1985-.\") OR (\"esp{tilde}de relaciones exteriores 1985-.\"))".
• Removing quotes may allow a broader search: (( esp{tilde}na relaciones exteriores 1985-. ) OR ( esp{tilde}de relaciones exteriores 1985-. )).
• Adding a wildcard symbol may retrieve word variants: (("esp{tilde}na relaciones exteriores 1985-.") OR ("esp{tilde}de relaciones exteriores 1985-."))*.