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.", "process control estadisticas medicas."
"procesos sciences statistical methods." » "procesos ciencias statistical methods.", "procesos sociales statistical methods.", "procesos civiles statistical methods.", "procesos sciences 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: (("procesos sciences statistical methods.") or ("process control estadisticas methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesos sciences statistical methods.") OR ("process control estadisticas methods."))*.
• Removing quotes may allow a broader search: (( procesos sciences statistical methods. ) or ( process control estadisticas methods. ))*.