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