Perhaps you should try some spelling variations:
"50 meann decrease" » "50 mean decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 meannn decrease" (Expand Search), "50 mean_ decrease" (Expand Search), "50 mean_ decreased" (Expand Search), "5 means decrease" (Expand Search), "20 means decrease" (Expand Search)
"50 na decrease" » "50 nn decrease" (Expand Search), "50 pa decreased" (Expand Search), "50 la decreased" (Expand Search), "50 n_ decrease" (Expand Search), "50 n_ decreased" (Expand Search), "50 n_ decreases" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "40 na decrease" (Expand Search), "50 nsa decrease" (Expand Search), "50 nga decrease" (Expand Search), "50 μa 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)
"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), "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 a decrease") OR ("50 meann decrease"))) OR ("50 na decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 a decrease\") OR (\"50 meann decrease\"))) OR (\"50 na decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 a decrease ) OR ( 50 meann decrease ))) OR ( 50 na decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 a decrease") OR ("50 meann decrease"))) OR ("50 na decrease"))) OR ("50 n decrease"))*.