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