Perhaps you should try some spelling variations:
"nato science overview 1.1:, physics" » "nato science review 1.1:, physics", "nato service overview 1.1:, physics", "nato change overview 1.1:, physics", "radio science overview 1.1:, physics", "nato science overview 2:, physics"
"national science service big:, physics" » "natural science service big:, physics", "spatial science service big:, physics", "animal science service big:, physics", "national science services big:, physics", "national science service bi:, physics", "national science service bus:, physics", "national science service biig:, physics", "national science service busig:, physics", "national science service beiig:, physics"
"nato science service b:, physics" » "radio science service b:, physics", "nato science service bi:, physics", "nato science service bus:, physics", "nato science service bei:, 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 1.1:, physics") OR ((("nato science service b:, physics") OR ("national science service big:, physics")))).
• Removing quotes may allow a broader search: (( nato science overview 1.1:, physics ) or ((( nato science service b:, physics ) or ( national science service big:, physics )))).
• Adding a wildcard symbol may retrieve word variants: (("nato science overview 1.1:, physics") or ((("nato science service b:, physics") or ("national science service big:, physics"))))*.