Perhaps you should try some spelling variations:
mobile communication » risk communication
aided communication » risk communication
grid communication » risk communication, radar communication, _ communication
oral communication » today communications, radar 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-((((grid communication) or (aided communication))) or (((oral communication) or (mobile communication))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: fiber-((((grid communication) OR (aided communication))) OR (((oral communication) OR (mobile communication)))).
• Adding a wildcard symbol may retrieve word variants: fiber-((((grid communication) or (aided communication))) or (((oral communication) or (mobile communication))))*.