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Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("national science for peace and security servers _: physics and biophysics") OR ("nato science for pence and securing servers b: physics and biophysics")).
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• Adding a wildcard symbol may retrieve word variants: (("national science for peace and security servers _: physics and biophysics") or ("nato science for pence and securing servers b: physics and biophysics"))*.