Perhaps you should try some spelling variations:
"40 na decrease" » "40 a decrease" (Expand Search), "40 nn decrease" (Expand Search), "40 pa decreased" (Expand Search), "40 nm decrease" (Expand Search), "40 pa decrease" (Expand Search), "40 ns decrease" (Expand Search)
"50 ns decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 ms 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: "((\"40 na decrease\") OR (((\"50 ns decrease\") OR (\"50 ng decrease\"))))~".
• Removing quotes may allow a broader search: (( 40 na decrease ) OR ((( 50 ns decrease ) OR ( 50 ng decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("40 na decrease") OR ((("50 ns decrease") OR ("50 ng decrease"))))*.