Perhaps you should try some spelling variations:
today communications » oral communication, optical communications, _ communications
radar communication » railway communication, oral communication, product communication
aided communication » mobile communication
grid communication » oral communication, _ communication, product 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-((radar communication) or (today communications)) ) or ( fiber-((grid communication) or (((aided communication) OR (risk communication)))) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( fiber-((radar communication) OR (today communications)) ) OR ( fiber-((grid communication) OR (((aided communication) OR (risk communication)))) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( fiber-((radar communication) or (today communications)) ) or ( fiber-((grid communication) or (((aided communication) OR (risk communication)))) ))".
• Adding a wildcard symbol may retrieve word variants: (( fiber-((radar communication) or (today communications)) ) or ( fiber-((grid communication) or (((aided communication) OR (risk communication)))) ))*.