Perhaps you should try some spelling variations:
"conferencias magistral." » "conferencia magistral.", "convergencias magistral.", "conferences magistral."
"conferencias magistrales." » "conferencia magistrales.", "convergencias magistrales.", "conferences magistrales.", "conferencias magistrados."
"conferencia ministerial." » "convergencia ministerial.", "conference ministerial."

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: (("conferencia ministerial.") or ((("conferencias magistral.") OR ("conferencias magistrales."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("conferencia ministerial.") OR ((("conferencias magistral.") OR ("conferencias magistrales.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"conferencia ministerial.\") or (((\"conferencias magistral.\") OR (\"conferencias magistrales.\"))))".
• Removing quotes may allow a broader search: (( conferencia ministerial. ) or ((( conferencias magistral. ) OR ( conferencias magistrales. )))).
• Adding a wildcard symbol may retrieve word variants: (("conferencia ministerial.") or ((("conferencias magistral.") OR ("conferencias magistrales."))))*.