Perhaps you should try some spelling variations:
"experiencias pedagogicas" » "experiencia pedagogica"
"expediciones pedagogicas" » "orientaciones pedagogicas", "innovaciones pedagogicas"
"mediaciones pedagogicas" » "mediacion pedagogica", "implicaciones pedagogicas", "educaciones pedagogias"
"expedicion pedagogica" » "mediacion pedagogica", "experiencia pedagogica"

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

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