Perhaps you should try some spelling variations:
"proces contreles statistical methods." » "proces control statistical methods.", "proceso contralos statistical methods.", "proces contre statistical methods.", "procesos contables statistical methods."
"process control estadistico methods." » "process control statistical methods.", "process control estadisticas metodos.", "procesos control estadistico methods.", "proceso control estadistico methods.", "procesal control 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: "((\"process control estadistico methods.\") OR (\"proces contreles statistical methods.\"))~".
• Removing quotes may allow a broader search: (( process control estadistico methods. ) OR ( proces contreles statistical methods. ))~.
• Adding a wildcard symbol may retrieve word variants: (("process control estadistico methods.") OR ("proces contreles statistical methods."))*.