Perhaps you should try some spelling variations:
"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), "50 n 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 mean decrease" » "20 means 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 mean decrease"))) OR ("50 na decrease"))) OR ("50 μ decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 a decrease\") OR (\"50 mean decrease\"))) OR (\"50 na decrease\"))) OR (\"50 μ decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 a decrease ) OR ( 50 mean decrease ))) OR ( 50 na decrease ))) OR ( 50 μ decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 a decrease") OR ("50 mean decrease"))) OR ("50 na decrease"))) OR ("50 μ decrease"))*.