Perhaps you should try some spelling variations:
national science » natural science, spatial science, animal science
security sectors » security factors, security sensors, security actors
security sector » security second, security secure
nato science » radio science
peace » place, pence

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) OR (national science)) for peace AND ((((security sectors) OR (security sector))) OR (security services)) 1: physics AND biophysics.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nato science) OR (national science)) for peace and ((((security sectors) or (security sector))) or (security services)) 1: physics and biophysics".
• Adding a wildcard symbol may retrieve word variants: ((nato science) OR (national science)) for peace and ((((security sectors) or (security sector))) or (security services)) 1: physics and biophysics*.