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