Perhaps you should try some spelling variations:
voice communications » mobile communications (Expand Search), device communications (Expand Search), line communications (Expand Search)
burst communications » rural communication (Expand Search), b communications (Expand Search), bfsk communication (Expand Search)
edge communications » large communications (Expand Search), line communications (Expand Search), rate communications (Expand Search)
white » while (Expand Search)
director » direction (Expand Search), direct (Expand Search), directly (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: white ((((edge communications) OR (voice communications))) OR (burst communications)) director~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "white ((((edge communications) OR (voice communications))) OR (burst communications)) director".
• Adding a wildcard symbol may retrieve word variants: white ((((edge communications) OR (voice communications))) OR (burst communications)) director*.