Perhaps you should try some spelling variations:
"5 ppm decrease" » "5 _ decrease" (Expand Search)
"5 nn decrease" » "5 _ decrease" (Expand Search), "k nn decrease" (Expand Search), "_ nn decrease" (Expand Search)
"5 nm decrease" » "5 _ decrease" (Expand Search), "6 nm decrease" (Expand Search)
"5 point decrease" » "_ point decrease" (Expand Search), "a point decrease" (Expand Search), "3d point 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 nn decrease"))) OR ((("5 point decrease") OR ("5 nm decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"5 ppm decrease\") OR (\"5 nn decrease\"))) OR (((\"5 point decrease\") OR (\"5 nm decrease\"))))*".
• Removing quotes may allow a broader search: (((( 5 ppm decrease ) OR ( 5 nn decrease ))) OR ((( 5 point decrease ) OR ( 5 nm decrease ))))*.