Perhaps you should try some spelling variations:
"nato science theories 3:, physics" » "nato science three 3:, physics", "radio science theories 3:, physics", "national science theories 3:, physics"
"nato science theory b:, physics" » "radio science theory b:, physics", "national science theory b:, physics"

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 theories 3:, physics") OR ("nato science theory b:, physics"))*.
• Removing quotes may allow a broader search: (( nato science theories 3:, physics ) or ( nato science theory b:, physics ))*.