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