Perhaps you should try some spelling variations:
statistics methods » statistical methods, statistics methodology
processing state » processing spain, processing study, processing software
state statistics » spain statistics, health statistics, chile statistics
processing data » processing digital, processing spain, processing units
data statistics » death statistics, vital statistics, capital statistics

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• The words AND, OR and NOT may confuse the search; try adding quotes: "(( processing data statistics methods. ) OR ( processing state statistics methods. ))~".
• Adding a wildcard symbol may retrieve word variants: (( processing data statistics methods. ) OR ( processing state statistics methods. ))*.