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