Perhaps you should try some spelling variations:
"estudios serie administrativo general." » "estudios serie administracion general." (Expand Search), "estudios serie administrativo en." (Expand Search), "estudios serie administrativo del." (Expand Search), "estudios serie administrativa general." (Expand Search), "estudios servico administrativo general." (Expand Search), "estudios sede administrativa general." (Expand Search), "estudios socio administrativo general." (Expand Search), "studies series administrativo general." (Expand Search)
"estudios sobre administrativo general." » "estudios sobre administracion general." (Expand Search), "estudios sobre administrativo en." (Expand Search), "estudios sobre administrativo del." (Expand Search), "estudios sobre administracao general." (Expand Search), "estudios refere administrativo general." (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("estudios serie administrativo general.") OR ("estudios sobre administrativo general."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"estudios serie administrativo general.\") OR (\"estudios sobre administrativo general.\"))".
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• Adding a wildcard symbol may retrieve word variants: (("estudios serie administrativo general.") OR ("estudios sobre administrativo general."))*.