Perhaps you should try some spelling variations:
"aspectos ambientales socio economico ;" » "aspectos ambientales sonia economico ;", "aspectos ambientales sobre economico ;", "aspectos ambientales mario economico ;", "aspectos ambientales ciclo economico ;", "aspectos ambientales aspecto economico ;", "aspectos ambientales tecnico economico ;"
"aspectos ambientales y socioeconomicas ;" » "aspectos ambientales y socioeconomicos ;", "aspectos ambientales socioeconomica y ;", "aspectos ambientales de socioeconomia ;", "aspectos ambientales en socioeconomicas ;"

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: (("aspectos ambientales socio economico ;") or ("aspectos ambientales y socioeconomicas ;"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("aspectos ambientales socio economico ;") OR ("aspectos ambientales y socioeconomicas ;")).
• Removing quotes may allow a broader search: (( aspectos ambientales socio economico ; ) or ( aspectos ambientales y socioeconomicas ; )).
• Adding a wildcard symbol may retrieve word variants: (("aspectos ambientales socio economico ;") or ("aspectos ambientales y socioeconomicas ;"))*.