Perhaps you should try some spelling variations:
today communications » oral communication, _ communications
aided communication » mobile communication
radar communication » railway communication, grid communication, oral communication
risk communication » _ communication, mobile communication

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( fiber-((aided communication) or (((today communications) OR (optical communications)))) ) or ( fiber-((radar communication) or (risk communication)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( fiber-((aided communication) OR (((today communications) OR (optical communications)))) ) OR ( fiber-((radar communication) OR (risk communication)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( fiber-((aided communication) or (((today communications) OR (optical communications)))) ) or ( fiber-((radar communication) or (risk communication)) ))".
• Adding a wildcard symbol may retrieve word variants: (( fiber-((aided communication) or (((today communications) OR (optical communications)))) ) or ( fiber-((radar communication) or (risk communication)) ))*.