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:, physics", "nato science overview 1.1:, physics", "nato science overview 1.2:, physics"
"nato science service bus:, physics" » "radio science service bus:, physics", "national science service bus:, physics"
"nato science service based:, physics" » "radio science service based:, physics", "national science service based:, 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 service bus:, physics") OR ("nato science service based:, physics")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"nato science overview b:, physics\") or (((\"nato science service bus:, physics\") OR (\"nato science service based:, physics\"))))".
• Removing quotes may allow a broader search: (( nato science overview b:, physics ) or ((( nato science service bus:, physics ) OR ( nato science service based:, physics )))).
• Adding a wildcard symbol may retrieve word variants: (("nato science overview b:, physics") or ((("nato science service bus:, physics") OR ("nato science service based:, physics"))))*.