Perhaps you should try some spelling variations:
"50 nsn decrease" » "50 mean decrease" (Expand Search), "50 use decreased" (Expand Search), "50 ash decreased" (Expand Search), "50 ns_ decrease" (Expand Search), "50 nsa decrease" (Expand Search), "50 ns_ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 nssn decrease" (Expand Search), "50 ngsn decrease" (Expand Search), "50 μsn decrease" (Expand Search)
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 n_ decrease" (Expand Search), "50 na decrease" (Expand Search), "50 n_ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "59 nn decrease" (Expand Search), "50 nsn decrease" (Expand Search), "50 ngn decrease" (Expand Search), "50 μn decrease" (Expand Search)
"50 n decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 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 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 nn decrease\") OR (\"50 nsn decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((( 50 nn decrease ) OR ( 50 nsn decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 nn decrease") OR ("50 nsn decrease"))) OR ("50 n decrease"))*.