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