Perhaps you should try some spelling variations:
"placas foca investigacion" » "placas una investigacion", "placas de investigacion", "placas e investigacion"
"lucha con investigacion" » "lucha en investigacion", "lucha fcsh investigacion", "lucha de investigacion", "lucha por investigacion", "lucha contra investigacion"
"secas la investigacion" » "secas de investigacion", "lucas 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: (("secas la investigacion") or ((("lucha con investigacion") or ("placas foca investigacion"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("secas la investigacion") OR ((("lucha con investigacion") OR ("placas foca investigacion")))).
• Removing quotes may allow a broader search: (( secas la investigacion ) or ((( lucha con investigacion ) or ( placas foca investigacion )))).
• Adding a wildcard symbol may retrieve word variants: (("secas la investigacion") or ((("lucha con investigacion") or ("placas foca investigacion"))))*.