Perhaps you should try some spelling variations:
"lucha con investigacion" » "lucha en investigacion", "lucha foca investigacion", "lucha fcsh investigacion", "lucha por investigacion", "lucha contra investigacion"
"placas la investigacion" » "blancas la investigacion", "planas las investigacion", "placas de investigacion"
"secas de investigacion" » "becas de investigacion", "secado de investigacion", "cas de investigacion"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("secas de investigacion") or ((("lucha con investigacion") or ("placas la investigacion"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("secas de investigacion") OR ((("lucha con investigacion") OR ("placas la investigacion"))))*.
• Removing quotes may allow a broader search: (( secas de investigacion ) or ((( lucha con investigacion ) or ( placas la investigacion ))))*.