Perhaps you should try some spelling variations:
"50 nn decrease" » "50 a 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 c decrease" » "50 c decreased" (Expand Search), "50 a decrease" (Expand Search), "50 rc decreased" (Expand Search), "50 μ decrease" (Expand Search), "20 c decrease" (Expand Search), "30 c decrease" (Expand Search)
"5 c decrease" » "5 c decreased" (Expand Search), "5 a decrease" (Expand Search), "5 rc decreased" (Expand Search), "25 c 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 _ decrease\") OR (((((\"50 c decrease\") OR (\"5 c decrease\"))) OR (\"50 nn decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 _ decrease ) OR ((((( 50 c decrease ) OR ( 5 c decrease ))) OR ( 50 nn decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 _ decrease") OR ((((("50 c decrease") OR ("5 c decrease"))) OR ("50 nn decrease"))))*.