Perhaps you should try some spelling variations:
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search), "50 nsg decrease" (Expand Search), "50 μg decrease" (Expand Search), "50 _g decrease" (Expand Search)
"50 μn decrease" » "50 μnn decrease" (Expand Search), "50 μ_ decrease" (Expand Search), "50 μa decrease" (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 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 μn decrease\") OR (\"50 ng decrease\"))) OR (\"50 n decrease\"))~".
• Removing quotes may allow a broader search: (((( 50 μn decrease ) OR ( 50 ng decrease ))) OR ( 50 n decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (((("50 μn decrease") OR ("50 ng decrease"))) OR ("50 n decrease"))*.