Perhaps you should try some spelling variations:
"lucan una investigacion" » "lucan la investigacion", "lucan ciencia investigacion", "lucan clinica investigacion", "lucas unas investigacion", "lucan ma investigacion", "lucas un investigacion"
"juan de investigacion" » "juan la investigacion", "juan dla investigacion", "juan dde investigaciones"
"luca e investigacion" » "luca la investigacion", "luca de investigaciones", "luca 5 investigacion", "luca g investigacion", "lucas el investigacion"

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: (((("lucan una investigacion") or ("luca e investigacion"))) or ("juan de investigacion"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lucan una investigacion") OR ("luca e investigacion"))) OR ("juan de investigacion")).
• Removing quotes may allow a broader search: (((( lucan una investigacion ) or ( luca e investigacion ))) or ( juan de investigacion )).
• Adding a wildcard symbol may retrieve word variants: (((("lucan una investigacion") or ("luca e investigacion"))) or ("juan de investigacion"))*.