Perhaps you should try some spelling variations:
"proceso contra linguistico methodology." » "proceso contra linguistics methodology.", "proceso contra linguistica metodologia.", "proceso contacto linguistico methodology.", "proceso contexto linguistico methodology.", "proceso cultura linguistica methodology."
"process control statistical methods." » "procesos control statistical methods.", "procesal control statistical methods.", "process control statistics methods.", "process control estadisticas 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 statistical methods.") or ("proceso contra linguistico methodology."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control statistical methods.") OR ("proceso contra linguistico methodology.")).
• Removing quotes may allow a broader search: (( process control statistical methods. ) or ( proceso contra linguistico methodology. )).
• Adding a wildcard symbol may retrieve word variants: (("process control statistical methods.") or ("proceso contra linguistico methodology."))*.