Perhaps you should try some spelling variations:
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"nato science services ch:, mathematical and physical sciences" » "nato science services ch:, mathematical and medical sciences", "nato science service ch:, mathematical and physical sciences", "nato voice services ch:, mathematical and physical sciences", "radio science services ch:, mathematical and physical sciences", "nato science services caseh:, mathematical and physical sciences"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("national science services c:, mathematical and physical sciences") OR ("national science overview c:, mathematical and physical sciences"))) OR ("nato science services ch:, mathematical and physical sciences")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"national science services c:, mathematical and physical sciences\") OR (\"national science overview c:, mathematical and physical sciences\"))) or (\"nato science services ch:, mathematical and physical sciences\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("national science services c:, mathematical and physical sciences") OR ("national science overview c:, mathematical and physical sciences"))) or ("nato science services ch:, mathematical and physical sciences"))*.