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