Perhaps you should try some spelling variations:
"50 nn decrease" » "50 _ decrease" (Expand Search)
"5 wt decrease" » "5 _ decrease" (Expand Search), "_ wt decrease" (Expand Search), "5 ht decrease" (Expand Search), "2 wt decrease" (Expand Search)
"_ fe decrease" » "_ _ decrease" (Expand Search), "_ e decrease" (Expand Search)
"_ ed decrease" » "_ _ decrease" (Expand Search), "_ red decrease" (Expand Search), "_ fed decrease" (Expand Search), "_ bed decrease" (Expand Search)

Try widening your search to All Fields.

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 wt decrease") OR ((("_ fe decrease") OR ("_ ed decrease"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 nn decrease\") OR (((\"5 wt decrease\") OR (((\"_ fe decrease\") OR (\"_ ed decrease\"))))))".
• Removing quotes may allow a broader search: (( 50 nn decrease ) OR ((( 5 wt decrease ) OR ((( _ fe decrease ) OR ( _ ed decrease )))))).
• Adding a wildcard symbol may retrieve word variants: (("50 nn decrease") OR ((("5 wt decrease") OR ((("_ fe decrease") OR ("_ ed decrease"))))))*.