Perhaps you should try some spelling variations:
mean decrease » a decrease (Expand Search)
ppm decrease » _ decrease (Expand Search), a decrease (Expand Search), pa decreased (Expand Search)
nn decrease » _ decrease (Expand Search), a decrease (Expand Search), gy decreased (Expand Search)
we decrease » _ decrease (Expand Search), a decrease (Expand Search), teer decrease (Expand Search)
50 mean » 20 means (Expand Search)
5 we » _ we (Expand Search), 5 wt (Expand Search), 5 w (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 (nn decrease)) ) OR ((( 50 mean decrease ) OR ( 5 we decrease ))))~".
• Adding a wildcard symbol may retrieve word variants: (( 50 ((ppm decrease) OR (nn decrease)) ) OR ((( 50 mean decrease ) OR ( 5 we decrease ))))*.