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 (oral communication))) or (aided communication)) ) or ( fiber-grid communication ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( fiber-((((optic communication) OR (oral communication))) OR (aided communication)) ) OR ( fiber-grid communication )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( fiber-((((optic communication) OR (oral communication))) or (aided communication)) ) or ( fiber-grid communication ))".
• Adding a wildcard symbol may retrieve word variants: (( fiber-((((optic communication) OR (oral communication))) or (aided communication)) ) or ( fiber-grid communication ))*.