Perhaps you should try some spelling variations:
"50 nn decrease" » "50 _ decrease" (Expand Search)
"5 we decrease" » "5 _ decrease" (Expand Search), "_ we decrease" (Expand Search)
"_ fe decrease" » "_ _ decrease" (Expand Search), "_ e decrease" (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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("50 nn decrease") OR ((((("5 we decrease") OR ("_ fe decrease"))) OR ("50 a decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 nn decrease\") OR (((((\"5 we decrease\") OR (\"_ fe decrease\"))) OR (\"50 a decrease\"))))*".
• Removing quotes may allow a broader search: (( 50 nn decrease ) OR ((((( 5 we decrease ) OR ( _ fe decrease ))) OR ( 50 a decrease ))))*.