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