Perhaps you should try some spelling variations:
"placas foca investigacion" » "placas la investigacion", "placas una investigacion", "placas e investigacion"
"lucha con investigacion" » "lucha en investigacion", "lucha fcsh investigacion", "lucha la investigacion", "lucha por investigacion", "lucha contra investigacion"
"becas de investigacion" » "becas la investigacion"

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

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