Perhaps you should try some spelling variations:
ngsn decrease » mean decrease (Expand Search)
nsn decrease » mean decrease (Expand Search), use decreased (Expand Search), ash decreased (Expand Search)
nn decrease » _ decrease (Expand Search), a decrease (Expand Search), mean decrease (Expand Search)
n decrease » _ decrease (Expand Search), a decrease (Expand Search), _ decreased (Expand Search)
50 nsn » 50 ns (Expand Search)
50 nn » 50 ns (Expand Search), 50 ng (Expand Search), 59 nn (Expand Search)
50 n » 50 ns (Expand Search), 50 ng (Expand Search), 50 μ (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 nn decrease ) OR ((( 50 nsn decrease ) OR ( 50 ngsn decrease ))))) OR ( 50 n decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (((( 50 nn decrease ) OR ((( 50 nsn decrease ) OR ( 50 ngsn decrease ))))) OR ( 50 n decrease ))*.