Perhaps you should try some spelling variations:
national science » natural science, animal science, natural sciences
rational science » regional science, traditional science, rational defence
spatial science » social 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: %((((national science) OR (spatial science))) OR (rational science)) communication%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((national science) OR (spatial science))) or (rational science)) communication%22".
• Adding a wildcard symbol may retrieve word variants: %((((national science) OR (spatial science))) or (rational science)) communication%22*.