Perhaps you should try some spelling variations:
"nato science overview b:, physics" » "nato science review b:, physics", "nato service overview b:, physics", "radio science overview b:, physics", "nato science overview 1.1:, physics"
"nato science overview 1.2:, physics" » "nato science review 1.2:, physics", "nato service overview 1.2:, physics", "radio science overview 1.2:, physics", "nato science overview 1.1:, physics", "nato science overview 2:, physics"
"national science overview 1.2:, physics" » "national science review 1.2:, physics", "national service overview 1.2:, physics", "natural science overview 1.2:, physics", "spatial science overview 1.2:, physics", "animal science overview 1.2:, physics", "national science overview 1.1:, physics", "national science overview 2:, physics"
"nato change overview b:, physics" » "nato care overview b:, physics", "faso change overview b:, physics", "native change overview b:, physics", "nature change overview b:, physics", "nato change overview 1.1:, 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 change overview b:, physics"))) OR ((("nato science overview 1.2:, physics") OR ("national science overview 1.2:, physics")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nato science overview b:, physics\") OR (\"nato change overview b:, physics\"))) or (((\"nato science overview 1.2:, physics\") or (\"national science overview 1.2:, physics\"))))".
• Removing quotes may allow a broader search: (((( nato science overview b:, physics ) OR ( nato change overview b:, physics ))) or ((( nato science overview 1.2:, physics ) or ( national science overview 1.2:, physics )))).
• Adding a wildcard symbol may retrieve word variants: (((("nato science overview b:, physics") OR ("nato change overview b:, physics"))) or ((("nato science overview 1.2:, physics") or ("national science overview 1.2:, physics"))))*.