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