Perhaps you should try some spelling variations:
controles administrativos » contratos administrativos, centros administrativos, costos administrativos
control administrativo » contratos administrativos, acto administrativo, contencioso administrativo
para economizar » para descolonizar, parra economista
para economia » otra economia, obra economia, parra economista

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((controles administrativos) or (control administrativo)) ((para economia) or (para economizar)) ((el derecho) OR (del derecho))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((controles administrativos) OR (control administrativo)) ((para economia) OR (para economizar)) ((el derecho) OR (del derecho)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((controles administrativos) or (control administrativo)) ((para economia) or (para economizar)) ((el derecho) OR (del derecho))".
• Adding a wildcard symbol may retrieve word variants: ((controles administrativos) or (control administrativo)) ((para economia) or (para economizar)) ((el derecho) OR (del derecho))*.