Perhaps you should try some spelling variations:
"white voice communications direction" » "white voice communications promotion" (Expand Search), "white voice communication connection" (Expand Search), "white voice communication reception" (Expand Search), "white mobile communications direction" (Expand Search), "white device communications direction" (Expand Search), "white line communications direction" (Expand Search), "white noise communications direction" (Expand Search)
"white burst communication communication" » "white burst communications communication" (Expand Search), "white rural communication communication" (Expand Search), "white bfsk communication communication" (Expand Search), "white forest communication communication" (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 voice communications direction") OR ("white burst communication communication"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"white voice communications direction\") OR (\"white burst communication communication\"))".
• Removing quotes may allow a broader search: (( white voice communications direction ) OR ( white burst communication communication )).
• Adding a wildcard symbol may retrieve word variants: (("white voice communications direction") OR ("white burst communication communication"))*.