Perhaps you should try some spelling variations:
"process control estadisticas methods." » "process control estadistica methods.", "process control estadistico methods.", "process control statistical methods.", "process control estadisticas metodos.", "process control estadisticas datos."
"proceso control linguistics methodology." » "proceso contact linguistics methodology.", "proceso contextos linguisticos methodology.", "proceso contacto linguistico methodology.", "proceso contra linguistics methodology.", "proceso contralos linguistics methodology.", "proces contre linguistics methodology."

Try widening your search to All Fields.

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 linguistics methodology.") or ("process control estadisticas methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("proceso control linguistics methodology.") OR ("process control estadisticas methods.")).
• Removing quotes may allow a broader search: (( proceso control linguistics methodology. ) or ( process control estadisticas methods. )).
• Adding a wildcard symbol may retrieve word variants: (("proceso control linguistics methodology.") or ("process control estadisticas methods."))*.