Perhaps you should try some spelling variations:
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"radio science service c:, mathematical and physical sciences" » "radio science service c:, mathematical and medical sciences"
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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 service c:, mathematical and physical sciences") OR ("radio science service c:, mathematical and physical sciences"))) OR ("nato voice services c:, mathematical and physical sciences"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato science service c:, mathematical and physical sciences\") OR (\"radio science service c:, mathematical and physical sciences\"))) or (\"nato voice services c:, mathematical and physical sciences\"))*".
• Removing quotes may allow a broader search: (((( nato science service c:, mathematical and physical sciences ) OR ( radio science service c:, mathematical and physical sciences ))) or ( nato voice services c:, mathematical and physical sciences ))*.