Perhaps you should try some spelling variations:
"proceso contralos statistical methods." » "proceso control statistical methods.", "proceso contra statistical methods.", "proces contreles statistical methods.", "procesos contables statistical methods."
"procesos tecnicas artisticas methods." » "procesos practicas artisticas methods.", "procesos tecnicas analiticas methods.", "procesos tecnicas practicas methods.", "progresos tecnicos artisticas methods.", "procesos teorias artisticas methods.", "propuestas tecnicas artisticas methods."

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"proceso contralos statistical methods.\") OR (\"procesos tecnicas artisticas methods.\"))~".
• Removing quotes may allow a broader search: (( proceso contralos statistical methods. ) OR ( procesos tecnicas artisticas methods. ))~.
• Adding a wildcard symbol may retrieve word variants: (("proceso contralos statistical methods.") OR ("procesos tecnicas artisticas methods."))*.