Perhaps you should try some spelling variations:
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 gy decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 n decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ decrease" (Expand Search), "0 a decrease" (Expand Search)
"5 a decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (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 nn decrease\") OR (((((\"50 a decrease\") OR (\"5 a decrease\"))) OR (\"50 c decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 nn decrease ) OR ((((( 50 a decrease ) OR ( 5 a decrease ))) OR ( 50 c decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 nn decrease") OR ((((("50 a decrease") OR ("5 a decrease"))) OR ("50 c decrease"))))*.