Perhaps you should try some spelling variations:
"procesos contables statistical methods." » "procesos control statistical methods.", "procesos sociales statistical methods.", "procesos penales statistical methods."
"progresos tecnicos practicas methods." » "progreso tecnico practicas methods.", "progresos tecnicas practicas methods.", "progresos teorico practicas methods.", "progresos tecnico tacticas methods.", "progresos tecnicos practicas letradas.", "progresos tecnicos practicas medicas."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("procesos contables statistical methods.") or ("progresos tecnicos practicas methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("procesos contables statistical methods.") OR ("progresos tecnicos practicas methods.")).
• Removing quotes may allow a broader search: (( procesos contables statistical methods. ) or ( progresos tecnicos practicas methods. )).
• Adding a wildcard symbol may retrieve word variants: (("procesos contables statistical methods.") or ("progresos tecnicos practicas methods."))*.