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