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