Perhaps you should try some spelling variations:
security serious » security seriously, security various, security services
security series » security services, security servers, security server
nato science » radio science, national science

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 for place AND security series b: physics AND biophysics ) OR ( nato science for place AND security serious b: physics AND biophysics )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( nato science for place and security series b: physics and biophysics ) OR ( nato science for place and security serious b: physics and biophysics ))".
• Adding a wildcard symbol may retrieve word variants: (( nato science for place and security series b: physics and biophysics ) OR ( nato science for place and security serious b: physics and biophysics ))*.