Perhaps you should try some spelling variations:
"nato sciences serious 1:, applied sciences" » "nato sciences second 1:, applied sciences", "nato sciences section 1:, applied sciences", "nano sciences serious 1:, applied sciences", "data sciences serious 1:, applied sciences", "earth sciences serious 1:, applied sciences", "radio sciences serious 1:, applied sciences", "national sciences serious 1:, applied sciences", "nato sciences serious _:, applied sciences", "nato sciences serious 2:, applied sciences", "nato sciences serious a:, applied sciences"
"nature sciences serious 1:, applied sciences" » "nature sciences second 1:, applied sciences", "nature sciences section 1:, applied sciences", "nature science serious 1:, applied sciences", "natural sciences serious 1:, applied sciences", "natured science serious 1:, applied sciences", "nature sciences serious _:, applied sciences", "nature sciences serious 2:, applied sciences", "nature sciences serious a:, applied sciences"
"nato science services 1:, applied sciences" » "nato science service 1:, applied sciences", "nato science overview 1:, applied sciences", "nato voice services 1:, applied sciences", "radio science services 1:, applied sciences", "national science services 1:, applied sciences", "nato science services 10:, applied sciences", "nato science services 12:, applied sciences", "nato science services 14:, applied sciences"

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 sciences serious 1:, applied sciences") OR ("nature sciences serious 1:, applied sciences"))) OR ("nato science services 1:, applied sciences")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato sciences serious 1:, applied sciences\") OR (\"nature sciences serious 1:, applied sciences\"))) or (\"nato science services 1:, applied sciences\"))".
• Removing quotes may allow a broader search: (((( nato sciences serious 1:, applied sciences ) OR ( nature sciences serious 1:, applied sciences ))) or ( nato science services 1:, applied sciences )).
• Adding a wildcard symbol may retrieve word variants: (((("nato sciences serious 1:, applied sciences") OR ("nature sciences serious 1:, applied sciences"))) or ("nato science services 1:, applied sciences"))*.