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