Perhaps you should try some spelling variations:
"las ciencias medicina" » "las ciencias medica", "las ciencias medicas", "las ciencia medica"
"dilema ciencia mexicana" » "dilema ciencia mexico", "dilema ciencia medica", "dilema poesia mexicana", "alma ciencia mexicana", "simpleza ciencia mexicana"
"arte ciencia medicas" » "arte ciencias medicas", "artes ciencias medicas", "ariel ciencia medicas", "arbor ciencia medicas"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("las ciencias medicina") or ("arte ciencia medicas"))) or ("dilema ciencia mexicana"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("las ciencias medicina") OR ("arte ciencia medicas"))) OR ("dilema ciencia mexicana"))*.
• Removing quotes may allow a broader search: (((( las ciencias medicina ) or ( arte ciencia medicas ))) or ( dilema ciencia mexicana ))*.