Perhaps you should try some spelling variations:
"natural sentences communication" » "natural enhances communication", "natural services communication", "natural sciences communications", "natural sequences communication", "causal sentences communication", "natural defences communication"
"natural sciences communication" » "natural sciences communications", "natural science communications", "natural schemes communication"
"natural science foundation" » "natural science education"

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