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