Perhaps you should try some spelling variations:
"50 ngn decrease" » "50 mean decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 ng_ decrease" (Expand Search), "50 nga decrease" (Expand Search), "50 ng_ decreased" (Expand Search), "50 ng decrease" (Expand Search), "50 nsgn decrease" (Expand Search), "50 nggn decrease" (Expand Search), "50 μgn decrease" (Expand Search)
"50 nsa decrease" » "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 use decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 nssa decrease" (Expand Search), "50 ngsa decrease" (Expand Search), "50 μsa 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)

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 ngn decrease"))) OR ("50 nsa decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 nn decrease\") OR (\"50 ngn decrease\"))) OR (\"50 nsa decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 nn decrease ) OR ( 50 ngn decrease ))) OR ( 50 nsa decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 nn decrease") OR ("50 ngn decrease"))) OR ("50 nsa decrease"))) OR ("50 n decrease"))*.