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