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

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nato asi subseries f:, computer and systems science") OR ("nato asi subseries f:, computer and system sciences"))) OR ("nato asi subseries a:, computer and systems science")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato asi subseries f:, computer and systems science\") OR (\"nato asi subseries f:, computer and system sciences\"))) or (\"nato asi subseries a:, computer and systems science\"))".
• Removing quotes may allow a broader search: (((( nato asi subseries f:, computer and systems science ) OR ( nato asi subseries f:, computer and system sciences ))) or ( nato asi subseries a:, computer and systems science )).
• Adding a wildcard symbol may retrieve word variants: (((("nato asi subseries f:, computer and systems science") OR ("nato asi subseries f:, computer and system sciences"))) or ("nato asi subseries a:, computer and systems science"))*.