Perhaps you should try some spelling variations:
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 gy decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 n decrease" (Expand Search)
"5 wt decrease" » "5 we decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 awd decreased" (Expand Search), "_ wt decrease" (Expand Search)
"5 ht decrease" » "5 _ decrease" (Expand Search), "5 we decrease" (Expand Search), "5 step decrease" (Expand Search), "5 h decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ decrease" (Expand Search), "50 c 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 ((("50 a decrease") OR ((("5 wt decrease") OR ("5 ht decrease"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 nn decrease\") OR (((\"50 a decrease\") OR (((\"5 wt decrease\") OR (\"5 ht decrease\"))))))".
• Removing quotes may allow a broader search: (( 50 nn decrease ) OR ((( 50 a decrease ) OR ((( 5 wt decrease ) OR ( 5 ht decrease )))))).
• Adding a wildcard symbol may retrieve word variants: (("50 nn decrease") OR ((("50 a decrease") OR ((("5 wt decrease") OR ("5 ht decrease"))))))*.