Perhaps you should try some spelling variations:
"national science communication" » "spatial science communication", "natural sciences communication", "educational sciences communication"
"natural science communication" » "natural sciences communication"

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 communication") OR ("natural science communication"))) OR ("animal science communication")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"national science communication\") OR (\"natural science communication\"))) or (\"animal science communication\"))".
• Removing quotes may allow a broader search: (((( national science communication ) OR ( natural science communication ))) or ( animal science communication )).
• Adding a wildcard symbol may retrieve word variants: (((("national science communication") OR ("natural science communication"))) or ("animal science communication"))*.