Perhaps you should try some spelling variations:
"proceso continuo linguistico methodology." » "proceso continuo linguistics methodology.", "proceso continuo linguistica metodologia.", "proceso contacto linguistico methodology.", "proceso contexto linguistico methodology.", "proceso conflicto linguistico methodology.", "proceso contra linguistico methodology."
"proceso control statistical methods." » "process control statistical methods.", "proceso contra statistical methods.", "proceso contralos statistical methods.", "proceso control statistics methods.", "proceso control estadisticas methods."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("proceso control statistical methods.") OR ("proceso continuo linguistico methodology."))~.
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