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)
"_ w_ decrease" » "_ _ decrease" (Expand Search), "_ _ decreased" (Expand Search), "_ _ decreases" (Expand Search), "_ wt decrease" (Expand Search), "_ we decrease" (Expand Search), "_ w decrease" (Expand Search)
"5 e decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (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 (\"5 e decrease\"))) OR (\"_ w_ decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 nn decrease ) OR ((((( 5 we decrease ) OR ( 5 e decrease ))) OR ( _ w_ decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 nn decrease") OR ((((("5 we decrease") OR ("5 e decrease"))) OR ("_ w_ decrease"))))*.