Perhaps you should try some spelling variations:
"5 ppm decrease" » "5 _ decrease" (Expand Search)
"5 mm decrease" » "5 _ decrease" (Expand Search), "2 mm decrease" (Expand Search), "_ mm decrease" (Expand Search)
"5 point decrease" » "_ point decrease" (Expand Search), "a point decrease" (Expand Search), "3d point decrease" (Expand Search)
"5 fold decrease" » "_ fold 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 fold decrease") OR ("5 point decrease"))) OR ("5 mm decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"5 ppm decrease\") OR (((((\"5 fold decrease\") OR (\"5 point decrease\"))) OR (\"5 mm decrease\"))))*".
• Removing quotes may allow a broader search: (( 5 ppm decrease ) OR ((((( 5 fold decrease ) OR ( 5 point decrease ))) OR ( 5 mm decrease ))))*.