Perhaps you should try some spelling variations:
"luchar foca investigacion" » "luchar una investigacion", "luchar de investigacion", "luchar e investigacion"
"luchar con investigacion" » "luchar en investigacion", "luchar fcsh investigacion", "luchar de investigacion", "lucha con investigacion", "luchar por investigacion"
"becas la investigacion" » "secas la investigacion", "brechas la investigacion", "beiras 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: (("becas la investigacion") or ((("luchar con investigacion") OR ("luchar foca investigacion"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("becas la investigacion") OR ((("luchar con investigacion") OR ("luchar foca investigacion")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"becas la investigacion\") or (((\"luchar con investigacion\") OR (\"luchar foca investigacion\"))))".
• Removing quotes may allow a broader search: (( becas la investigacion ) or ((( luchar con investigacion ) OR ( luchar foca investigacion )))).
• Adding a wildcard symbol may retrieve word variants: (("becas la investigacion") or ((("luchar con investigacion") OR ("luchar foca investigacion"))))*.