Perhaps you should try some spelling variations:
"lucas una investigacion" » "lucas de investigacion", "lucas e investigacion", "lucas ciencia investigacion", "lucas une investigacion", "lucas unde investigacion", "lucas unen investigacion", "lucas unas investigacion", "lucas un investigacion", "lucas la investigacion"
"secas la investigacion" » "secas le investigacion", "secas lde investigacion", "secas len investigacion", "secas de investigacion", "lucas la investigacion"
"lucas a investigacion" » "lucas e investigacion", "lucas de investigacion", "lucas en investigacion", "lucas la investigacion", "lucas f investigacion", "lucas i 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: (("secas la investigacion") or ((("lucas a investigacion") OR ("lucas una investigacion"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("secas la investigacion") OR ((("lucas a investigacion") OR ("lucas una investigacion")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"secas la investigacion\") or (((\"lucas a investigacion\") OR (\"lucas una investigacion\"))))".
• Removing quotes may allow a broader search: (( secas la investigacion ) or ((( lucas a investigacion ) OR ( lucas una investigacion )))).
• Adding a wildcard symbol may retrieve word variants: (("secas la investigacion") or ((("lucas a investigacion") OR ("lucas una investigacion"))))*.