Perhaps you should try some spelling variations:
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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nato science series 10:, applied sciences") OR ("national science series 10:, applied sciences"))) OR ("nato science services 10:, applied sciences")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato science series 10:, applied sciences\") OR (\"national science series 10:, applied sciences\"))) or (\"nato science services 10:, applied sciences\"))".
• Removing quotes may allow a broader search: (((( nato science series 10:, applied sciences ) OR ( national science series 10:, applied sciences ))) or ( nato science services 10:, applied sciences )).
• Adding a wildcard symbol may retrieve word variants: (((("nato science series 10:, applied sciences") OR ("national science series 10:, applied sciences"))) or ("nato science services 10:, applied sciences"))*.