Perhaps you should try some spelling variations:
"proceso contralos statistical methods." » "proceso control statistical methods.", "proceso contra statistical methods.", "proces contreles statistical methods.", "procesos contables statistical methods."
"procesos control estadistico methods." » "procesos control statistical methods.", "procesos control estadisticas metodos.", "process control estadistico methods.", "proceso contra estadistico methods.", "procesos contables estadistico methods."

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"proceso contralos statistical methods.\") OR (\"procesos control estadistico methods.\"))~".
• Removing quotes may allow a broader search: (( proceso contralos statistical methods. ) OR ( procesos control estadistico methods. ))~.
• Adding a wildcard symbol may retrieve word variants: (("proceso contralos statistical methods.") OR ("procesos control estadistico methods."))*.