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 mgn decrease" (Expand Search), "10 ngn decrease" (Expand Search), "5 ngn decrease" (Expand Search)
"50 nga decrease" » "50 a decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 mga decrease" (Expand Search), "10 nga decrease" (Expand Search), "5 nga decrease" (Expand Search)
"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)

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 nga decrease\"))) OR (\"50 ng decrease\"))~".
• Removing quotes may allow a broader search: (((( 50 ngn decrease ) OR ( 50 nga decrease ))) OR ( 50 ng decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (((("50 ngn decrease") OR ("50 nga decrease"))) OR ("50 ng decrease"))*.