Perhaps you should try some spelling variations:
ppm decrease » _ decrease (Expand Search), a decrease (Expand Search), pa decreased (Expand Search)
nn decrease » _ decrease (Expand Search), a decrease (Expand Search), mean decrease (Expand Search)
g decrease » _ decrease (Expand Search), a decrease (Expand Search), gy decreased (Expand Search)
w decrease » we decrease (Expand Search), _ decrease (Expand Search), a decrease (Expand Search)
50 ppm » 5 ppm (Expand Search)
50 nn » 50 ns (Expand Search), 50 ng (Expand Search), 50 n (Expand Search)
5 g » 5 mg (Expand Search)
5 w » 5 wt (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( 50 ppm decrease ) OR ((( 50 nn decrease ) OR ((( 5 g decrease ) OR ( 5 w decrease ))))))~".
• Adding a wildcard symbol may retrieve word variants: (( 50 ppm decrease ) OR ((( 50 nn decrease ) OR ((( 5 g decrease ) OR ( 5 w decrease ))))))*.