Perhaps you should try some spelling variations:
"conferencia ministeriales." » "conferencia ministerial.", "conferencias magistrales."
"conferencia magistrales." » "conferencias magistrales.", "conferencias magistraleses.", "conferencia ministeriales.", "conferencia nacionales."
"conferencia magistral." » "conferencias magistrales.", "conferencia ministerial.", "conferencia nacional."

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

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