Perhaps you should try some spelling variations:
"proceso contacto linguistico methodology." » "proceso contacto linguistics methodology.", "proceso contacto linguistica metodologia.", "proceso continuo linguistico methodology.", "proceso contralos linguistico methodology.", "proceso contra linguistico methodology."
"process control statistics methods." » "process control statistical methods.", "process control estadistico methods.", "process control estadistica methods.", "process control statistics methodology.", "procesos control statistics methods.", "procesal control statistics methods."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("process control statistics methods.") or ("proceso contacto linguistico methodology."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistics methods.") OR ("proceso contacto linguistico methodology.")).
• Removing quotes may allow a broader search: (( process control statistics methods. ) or ( proceso contacto linguistico methodology. )).
• Adding a wildcard symbol may retrieve word variants: (("process control statistics methods.") or ("proceso contacto linguistico methodology."))*.