Perhaps you should try some spelling variations:
ppm decrease » _ decrease (Expand Search), a decrease (Expand Search), nn decrease (Expand Search)
ns decrease » nn decrease (Expand Search), _ decrease (Expand Search), a decrease (Expand Search)
we decrease » _ decrease (Expand Search), a decrease (Expand Search), nn decrease (Expand Search)
w decrease » _ decrease (Expand Search), a decrease (Expand Search), _ decreased (Expand Search)
50 ppm » 5 ppm (Expand Search)
50 ns » 50 ms (Expand Search)
_ we » _ web (Expand Search), _ wet (Expand Search), _ e (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 ns decrease ) OR ((( _ we decrease ) OR ( 5 w decrease ))))))~".
• Adding a wildcard symbol may retrieve word variants: (( 50 ppm decrease ) OR ((( 50 ns decrease ) OR ((( _ we decrease ) OR ( 5 w decrease ))))))*.