Perhaps you should try some spelling variations:
"nato science overview b:, physics" » "nato science review b:, physics", "nato service overview b:, physics", "nato change overview b:, physics", "radio science overview b:, physics", "national science overview b:, physics", "nato science overview 1.1:, physics", "nato science overview 1.2:, physics"
"nato science overview 1:, physics" » "nato science review 1:, physics", "nato service overview 1:, physics", "nato change overview 1:, physics", "radio science overview 1:, physics", "national science overview 1:, physics", "nato science overview 2:, physics"
"nato science service b:, physics" » "radio science service b:, physics", "national science service b:, physics", "nato science service bus:, physics", "nato science service big:, physics", "nato science service bei:, physics"
"nato science service bi:, physics" » "radio science service bi:, physics", "national science service bi:, physics", "nato science service bus:, physics", "nato science service busi:, physics", "nato science service bigi:, physics", "nato science service beii:, physics"

Try widening your search to All Fields.

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 overview b:, physics") OR ("nato science overview 1:, physics"))) OR ((("nato science service b:, physics") OR ("nato science service bi:, physics")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato science overview b:, physics\") OR (\"nato science overview 1:, physics\"))) or (((\"nato science service b:, physics\") or (\"nato science service bi:, physics\"))))".
• Removing quotes may allow a broader search: (((( nato science overview b:, physics ) OR ( nato science overview 1:, physics ))) or ((( nato science service b:, physics ) or ( nato science service bi:, physics )))).
• Adding a wildcard symbol may retrieve word variants: (((("nato science overview b:, physics") OR ("nato science overview 1:, physics"))) or ((("nato science service b:, physics") or ("nato science service bi:, physics"))))*.