Perhaps you should try some spelling variations:
"primer contacto linguistico methodology." » "primer contacto linguistics methodology.", "primer contacto linguistica metodologia.", "primeros contactos 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."

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

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