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