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