Perhaps you should try some spelling variations:
sciences serious » sciences second, sciences section
science theories » science three
science studies » science study, defence studies
physics » physical

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 studies) OR (sciences serious))) OR (((science theories) OR (science theory)))) b:, physics.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nato ((((science studies) or (sciences serious))) or (((science theories) OR (science theory)))) b:, physics".
• Adding a wildcard symbol may retrieve word variants: nato ((((science studies) or (sciences serious))) or (((science theories) OR (science theory)))) b:, physics*.