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

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