Perhaps you should try some spelling variations:
"procesos sociales statistical methods." » "procesos sociology statistical methods.", "procesos sciences statistical methods.", "procesos science statistical methods."
"process control estadistica methods." » "process control estadistico methods.", "process control statistical methods.", "process economia estadistica methods.", "process control estadisticas metodos.", "process control estadisticas medicas.", "proceso control estadistica methods.", "procesal control estadistica 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 estadistica methods.") or ("procesos sociales statistical methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("process control estadistica methods.") OR ("procesos sociales statistical methods.")).
• Removing quotes may allow a broader search: (( process control estadistica methods. ) or ( procesos sociales statistical methods. )).
• Adding a wildcard symbol may retrieve word variants: (("process control estadistica methods.") or ("procesos sociales statistical methods."))*.