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