Perhaps you should try some spelling variations:
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"mathematical sciences research institutions publications" » "mathematical sciences research institutional publications", "mathematical sciences research institutions applications", "mathematical sciences research institutions obligation", "mathematical sciences research institutes publications", "mathematical sciences research contributions publications", "mathematical sciences research implications publications", "mathematical science research institutions publications"
"mathematical services research institutions publications" » "mathematical services research institutional publications", "mathematical services research institutions applications", "mathematical services research institutions obligation", "mathematical services research institutes publications", "mathematical services research contributions publications", "mathematical services research implications publications", "mathematical service research institutions publications", "mathematical surfaces research institutions publications", "mathematical surprises research institutions publications"
"mathematical services research institute publications" » "mathematical services research institutional publications", "mathematical services research institute reflections", "mathematical services research institutes application", "mathematical service research institute publications", "mathematical surfaces research institute publications", "mathematical surprises research institute publications"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("mathematical sciences research institutions publications") OR ((((("mathematical services research institutions publications") OR ("mathematical services research institute publications"))) OR ("mathematical services research institutions implications")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mathematical sciences research institutions publications\") or (((((\"mathematical services research institutions publications\") OR (\"mathematical services research institute publications\"))) or (\"mathematical services research institutions implications\"))))".
• Removing quotes may allow a broader search: (( mathematical sciences research institutions publications ) or ((((( mathematical services research institutions publications ) OR ( mathematical services research institute publications ))) or ( mathematical services research institutions implications )))).
• Adding a wildcard symbol may retrieve word variants: (("mathematical sciences research institutions publications") or ((((("mathematical services research institutions publications") OR ("mathematical services research institute publications"))) or ("mathematical services research institutions implications"))))*.