Perhaps you should try some spelling variations:
"international security for mathematics science" » "international security for mathematical sciences"
"national security for mathematics science" » "national security for mathematical sciences"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"international security for mathematics science\") OR (\"national security for mathematics science\"))".
• Removing quotes may allow a broader search: (( international security for mathematics science ) OR ( national security for mathematics science )).
• Adding a wildcard symbol may retrieve word variants: (("international security for mathematics science") OR ("national security for mathematics science"))*.