Perhaps you should try some spelling variations:
"5 ppm decrease" » "5 _ decrease" (Expand Search)
"50 ns decrease" » "50 _ decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "5 a decrease" (Expand Search), "50 i decrease" (Expand Search)
"5 mean decrease" » "_ mean decrease" (Expand Search), "a mean decrease" (Expand Search), "c mean decrease" (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: (((((("5 ppm decrease") OR ("5 mean decrease"))) OR ("50 a decrease"))) OR ("50 ns decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"5 ppm decrease\") OR (\"5 mean decrease\"))) OR (\"50 a decrease\"))) OR (\"50 ns decrease\"))*".
• Removing quotes may allow a broader search: (((((( 5 ppm decrease ) OR ( 5 mean decrease ))) OR ( 50 a decrease ))) OR ( 50 ns decrease ))*.