Perhaps you should try some spelling variations:
"50 ngsn decrease" » "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 ngsnn decrease" (Expand Search), "50 ngs_ decrease" (Expand Search), "50 ngs_ decreased" (Expand Search), "50 nsgsn decrease" (Expand Search), "50 nggsn decrease" (Expand Search), "50 _gsn decrease" (Expand Search)
"50 μ decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "10 μ decrease" (Expand Search), "5 μ decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 c decrease" (Expand Search), "5 a decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng 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 a decrease") OR ("50 μ decrease"))) OR ("50 ngsn decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 a decrease\") OR (\"50 μ decrease\"))) OR (\"50 ngsn decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 a decrease ) OR ( 50 μ decrease ))) OR ( 50 ngsn decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 a decrease") OR ("50 μ decrease"))) OR ("50 ngsn decrease"))) OR ("50 n decrease"))*.