Perhaps you should try some spelling variations:
"lucas una investigacion" » "lucas de investigacion", "lucas e investigacion", "lucas ciencia investigacion", "lucas unas investigacion", "lucas un investigacion", "lucas la investigacion"
"lucanor la investigacion" » "lucanor y investigacion", "lucanor de investigacion", "lucanor et investigacion"
"lucan la investigacion" » "lucan ma investigacion", "lucas la investigacion", "duncan la 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 la investigacion") OR ("lucanor la investigacion"))) or ("lucas una investigacion"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lucan la investigacion") OR ("lucanor la investigacion"))) OR ("lucas una investigacion")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"lucan la investigacion\") OR (\"lucanor la investigacion\"))) or (\"lucas una investigacion\"))".
• Removing quotes may allow a broader search: (((( lucan la investigacion ) OR ( lucanor la investigacion ))) or ( lucas una investigacion )).
• Adding a wildcard symbol may retrieve word variants: (((("lucan la investigacion") OR ("lucanor la investigacion"))) or ("lucas una investigacion"))*.