Perhaps you should try some spelling variations:
"nato science services e:, applied sciences" » "nato science service e:, applied sciences", "nato science overview e:, applied sciences", "nato voice services e:, applied sciences", "radio science services e:, applied sciences"
"national science services e:, applied sciences" » "national science service e:, applied sciences", "national science overview e:, applied sciences", "national voice services e:, applied sciences", "natural science services e:, applied sciences", "spatial science services e:, applied sciences", "natural sciences services e:, applied sciences"
"animal science services e:, applied sciences" » "animal science service e:, applied sciences", "animal science overview e:, applied sciences", "animal voice services e:, 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 science services e:, applied sciences") OR ((("national science services e:, applied sciences") OR ("animal science services e:, applied sciences")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nato science services e:, applied sciences\") or (((\"national science services e:, applied sciences\") OR (\"animal science services e:, applied sciences\"))))".
• Removing quotes may allow a broader search: (( nato science services e:, applied sciences ) or ((( national science services e:, applied sciences ) OR ( animal science services e:, applied sciences )))).
• Adding a wildcard symbol may retrieve word variants: (("nato science services e:, applied sciences") or ((("national science services e:, applied sciences") OR ("animal science services e:, applied sciences"))))*.