Perhaps you should try some spelling variations:
"process control estadistico methods." » "process control statistical methods.", "process control estadisticas metodos.", "proceso control estadistico methods.", "procesal control estadistico methods."
"procesos control estadistico methods." » "procesos control statistical methods.", "procesos control estadisticas metodos.", "proceso contra estadistico methods.", "procesos contables estadistico methods.", "proceso contralos estadistico 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 estadistico methods.") OR ("procesos control estadistico methods."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"process control estadistico methods.\") OR (\"procesos control estadistico methods.\"))*".
• Removing quotes may allow a broader search: (( process control estadistico methods. ) OR ( procesos control estadistico methods. ))*.