Perhaps you should try some spelling variations:
"50 nn decrease" » "50 _ decrease" (Expand Search)
"i wt decrease" » "i _ decrease" (Expand Search), "_ wt decrease" (Expand Search), "i et decrease" (Expand Search), "2 wt decrease" (Expand Search)
"_ fe decrease" » "_ _ decrease" (Expand Search), "_ f_ decrease" (Expand Search), "_ f_ decreased" (Expand Search), "_ f_ 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 (((((\"_ e decrease\") OR (\"i wt decrease\"))) OR (\"_ fe decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 nn decrease ) OR ((((( _ e decrease ) OR ( i wt decrease ))) OR ( _ fe decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 nn decrease") OR ((((("_ e decrease") OR ("i wt decrease"))) OR ("_ fe decrease"))))*.