Perhaps you should try some spelling variations:
"procesos programas statistical methods." » "procesos programas estadisticos methods.", "procesos programas artisticos methods.", "procesos geography statistical methods.", "proyectos programas statistical methods.", "procesos formas statistical methods."
"proyectos problems statistical methods." » "proyectos programas statistical methods.", "proyectos project statistical methods.", "proyecto profes statistical methods."

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: (("procesos programas statistical methods.") or ("proyectos problems statistical methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesos programas statistical methods.") OR ("proyectos problems statistical methods.")).
• Removing quotes may allow a broader search: (( procesos programas statistical methods. ) or ( proyectos problems statistical methods. )).
• Adding a wildcard symbol may retrieve word variants: (("procesos programas statistical methods.") or ("proyectos problems statistical methods."))*.