Perhaps you should try some spelling variations:
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 n decrease" (Expand Search), "59 nn decrease" (Expand Search)
"50 ng decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 we decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search)
"50 ns decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 we decrease" (Expand Search), "50 ms 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 nn decrease\") OR (\"50 ng decrease\"))) OR (\"50 ns decrease\"))~".
• Removing quotes may allow a broader search: (((( 50 nn decrease ) OR ( 50 ng decrease ))) OR ( 50 ns decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (((("50 nn decrease") OR ("50 ng decrease"))) OR ("50 ns decrease"))*.