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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"process control statistical methodology.\") OR (\"procesos control estadistico methods.\"))~".
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