Perhaps you should try some spelling variations:
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"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"
"nato science series 2:, applied sciences" » "nato science stories 2:, applied sciences", "nato science theories 2:, applied sciences", "nato science studies 2:, applied sciences", "radio science series 2:, applied sciences", "national science series 2:, applied sciences", "nato science series 3:, applied sciences"

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 science series 2:, applied sciences") OR ("nato sciences serious 2:, applied sciences"))) OR ("nato science services 1:, applied sciences")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato science series 2:, applied sciences\") OR (\"nato sciences serious 2:, applied sciences\"))) or (\"nato science services 1:, applied sciences\"))".
• Removing quotes may allow a broader search: (((( nato science series 2:, applied sciences ) OR ( nato sciences serious 2:, applied sciences ))) or ( nato science services 1:, applied sciences )).
• Adding a wildcard symbol may retrieve word variants: (((("nato science series 2:, applied sciences") OR ("nato sciences serious 2:, applied sciences"))) or ("nato science services 1:, applied sciences"))*.