Perhaps you should try some spelling variations:
"50 ngsn decrease" » "50 mean decrease" (Expand Search)
"50 nsn decrease" » "50 mean decrease" (Expand Search), "50 use decreased" (Expand Search), "50 ash decreased" (Expand Search), "50 ns decrease" (Expand Search)
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 n decrease" (Expand Search)
"50 μ decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "10 μ decrease" (Expand Search), "5 μ decrease" (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("50 nn decrease") OR ((("50 nsn decrease") OR ("50 ngsn decrease"))))) OR ("50 μ decrease"))~.
• 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 μ decrease\"))".
• Removing quotes may allow a broader search: (((( 50 nn decrease ) OR ((( 50 nsn decrease ) OR ( 50 ngsn decrease ))))) OR ( 50 μ decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 nn decrease") OR ((("50 nsn decrease") OR ("50 ngsn decrease"))))) OR ("50 μ decrease"))*.