Perhaps you should try some spelling variations:
physical sciences » medical sciences
science theories » science theory, science three
science services » science service, science overview, voice services
science series » science stories, sciences serious, science studies

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 series) OR (science theories))) OR (science services)) c:, mathematical AND physical sciences.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nato ((((science series) OR (science theories))) or (science services)) c:, mathematical and physical sciences".
• Adding a wildcard symbol may retrieve word variants: nato ((((science series) OR (science theories))) or (science services)) c:, mathematical and physical sciences*.