Perhaps you should try some spelling variations:
"proceso apendice estadistico methods." » "proceso aprendizaje estadistico methods.", "proceso apendice estadisticas metodos.", "europeo apendice estadistico methods.", "oses apendice estadistico methods.", "primer apendice estadistico methods."
"procesos control statistical methods." » "process control statistical methods.", "proceso contra statistical methods.", "procesos contables statistical methods.", "procesos control statistics methods.", "procesos control estadisticas 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 control statistical methods.") or ("proceso apendice estadistico methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesos control statistical methods.") OR ("proceso apendice estadistico methods.")).
• Removing quotes may allow a broader search: (( procesos control statistical methods. ) or ( proceso apendice estadistico methods. )).
• Adding a wildcard symbol may retrieve word variants: (("procesos control statistical methods.") or ("proceso apendice estadistico methods."))*.