Perhaps you should try some spelling variations:
"50 ngn decrease" » "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 ngnn decrease" (Expand Search), "50 ng_ decrease" (Expand Search), "50 nga decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 nsgn decrease" (Expand Search), "50 nggn decrease" (Expand Search), "50 μgn decrease" (Expand Search)
"5 μ decrease" » "5 _ decrease" (Expand Search), "5 a decrease" (Expand Search), "5 _ decreased" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 ngn decrease\") OR (((\"50 n decrease\") OR (\"5 μ decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 ngn decrease ) OR ((( 50 n decrease ) OR ( 5 μ decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 ngn decrease") OR ((("50 n decrease") OR ("5 μ decrease"))))*.