Perhaps you should try some spelling variations:
"valle hurtado, luis f" » "valle hurtado, luis a", "valley hurtado, luis f", "falle hurtado, luis f", "valve hurtado, luis f"
"value hurtado, luis g" » "value hurtado, luis a"
"duque hurtado, luis g" » "duque hurtado, luis a", "luque hurtado, luis g"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("valle hurtado, luis f") OR ((("value hurtado, luis de") OR ((("value hurtado, luis g") OR ("duque hurtado, luis g")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"valle hurtado, luis f\") or (((\"value hurtado, luis de\") or (((\"value hurtado, luis g\") OR (\"duque hurtado, luis g\"))))))".
• Removing quotes may allow a broader search: (( valle hurtado, luis f ) or ((( value hurtado, luis de ) or ((( value hurtado, luis g ) OR ( duque hurtado, luis g )))))).
• Adding a wildcard symbol may retrieve word variants: (("valle hurtado, luis f") or ((("value hurtado, luis de") or ((("value hurtado, luis g") OR ("duque hurtado, luis g"))))))*.