Perhaps you should try some spelling variations:
"nato asi subseries f:, computer and systems sciences" » "nato asi subseries f:, computer and systems science", "nato asi subseries f:, computer and systems geoscience", "nato asi subseries f:, computer and systems services", "nato asi subseries a:, computer and systems sciences", "nato asi substrates f:, computer and systems sciences", "nato arw subseries f:, computer and systems sciences"
"nato asi subseries f:, computer and system sciences" » "nato asi subseries f:, computer and systems sciences", "nato asi subseries a:, computer and system sciences", "nato asi substrates f:, computer and system sciences", "nato arw subseries f:, computer and system sciences"
"nato _ subseries f:, computer and system science" » "nato _ subseries f:, computer and systems science", "nato _ subseries a:, computer and system science", "nato _ substrates f:, computer and system science"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nato asi subseries f:, computer and system sciences") OR ("nato asi subseries f:, computer and systems sciences"))) OR ("nato _ subseries f:, computer and system science")).
• Removing quotes may allow a broader search: (((( nato asi subseries f:, computer and system sciences ) or ( nato asi subseries f:, computer and systems sciences ))) or ( nato _ subseries f:, computer and system science )).
• Adding a wildcard symbol may retrieve word variants: (((("nato asi subseries f:, computer and system sciences") or ("nato asi subseries f:, computer and systems sciences"))) or ("nato _ subseries f:, computer and system science"))*.