Perhaps you should try some spelling variations:
optic communication » optical communications, political communication, mobile communication
aided communication » risk communication, mobile communication
radar communication » railway communication, today communications, risk communication
oral communication » mobile communication, today communications, _ communication
grid communication » risk communication, _ communication, product 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) OR (radar 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) OR (radar 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) OR (radar communication)))) ))".
• Adding a wildcard symbol may retrieve word variants: (( fiber-((optic communication) or (aided communication)) ) or ( fiber-((oral communication) or (((grid communication) OR (radar communication)))) ))*.