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