Perhaps you should try some spelling variations:
"level supplementary series" » "level supplementary services", "level supplementary queries", "level supplementary steroids", "eleven supplementary series", "several supplementary series", "model supplementary series"
"severi supplementary series" » "severi supplementary services", "severi supplementary queries", "severi supplementary steroids", "several supplementary series", "eleven supplementary series", "stars supplementary series"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"level supplementary series\") OR (\"severi supplementary series\"))".
• Removing quotes may allow a broader search: (( level supplementary series ) OR ( severi supplementary series )).
• Adding a wildcard symbol may retrieve word variants: (("level supplementary series") OR ("severi supplementary series"))*.