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• Performing a fuzzy search may retrieve terms with similar spellings: (( india of south america health AND hygiene ) OR ( india of south american health AND hygiene ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( india of south america health AND hygiene ) OR ( india of south american health AND hygiene ))".
• Adding a wildcard symbol may retrieve word variants: (( india of south america health AND hygiene ) OR ( india of south american health AND hygiene ))*.