Perhaps you should try some spelling variations:
"50 mean decrease" » "50 a decrease" (Expand Search), "50 meann decrease" (Expand Search), "50 meaa decrease" (Expand Search), "50 mea_ decreased" (Expand Search), "20 means decrease" (Expand Search)
"50 ngnn decrease" » "50 nn decrease" (Expand Search), "50 ngnnn decrease" (Expand Search), "50 ngna decrease" (Expand Search), "50 ngn_ decreased" (Expand Search), "50 nsgnn decrease" (Expand Search), "50 nggnn decrease" (Expand Search), "50 μgnn decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 μ 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 mean decrease") OR ("50 ngnn decrease"))) OR ((("50 n decrease") OR ("50 _ decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 mean decrease\") OR (\"50 ngnn decrease\"))) OR (((\"50 n decrease\") OR (\"50 _ decrease\"))))".
• Removing quotes may allow a broader search: (((( 50 mean decrease ) OR ( 50 ngnn decrease ))) OR ((( 50 n decrease ) OR ( 50 _ decrease )))).
• Adding a wildcard symbol may retrieve word variants: (((("50 mean decrease") OR ("50 ngnn decrease"))) OR ((("50 n decrease") OR ("50 _ decrease"))))*.