Perhaps you should try some spelling variations:
"contencioso administrativas" » "contencioso administrativa", "contenciosos administrativo", "convenios administrativos"
"contencioso administrativos" » "contencioso administrativa", "contratos administrativos", "costos administrativos"
"contenciosa administrativa" » "contencioso administrativa", "contratacion administrativa", "corrupcion administrativa"

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

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