Perhaps you should try some spelling variations:
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"nato asi substrates f:, computer and system science" » "nato si substrates f:, computer and system science", "nato si substrate f:, computer and system science", "nato soi substrates f:, computer and system science", "nato asi substrates f:, computer and systems science", "nato asi substrates _:, computer and system science", "nato asi substrates a:, computer and system science", "nato asi substrates 8:, computer and system science"
"nato arw subseries f:, computer and system science" » "nato arw subseries f:, computer and systems science", "nato norm subseries f:, computer and system science", "nato _ subseries f:, computer and system science", "nato arw subseries a:, computer and system science"
"nato arw subseries f:, computer and system sciences" » "nato arw subseries f:, computer and systems sciences", "nato norm subseries f:, computer and system sciences", "nato _ subseries f:, computer and system sciences", "nato arw subseries a:, computer and system sciences"

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