Perhaps you should try some spelling variations:
"nato science services e:, applied sciences" » "nato science service 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 voice services e:, applied sciences", "natural science services e:, applied sciences", "spatial science services e:, applied sciences", "animal science services e:, applied sciences"
"national science overview e:, applied sciences" » "natural science overview e:, applied sciences", "spatial science overview e:, applied sciences", "animal science overview e:, applied sciences", "national science review e:, applied sciences", "national service overview e:, applied sciences", "national change overview e:, applied sciences", "national science overview over:, applied sciences"

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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 ("national science overview e:, applied sciences")))).
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