Perhaps you should try some spelling variations:
"20 means decrease" » "20 mean decrease" (Expand Search), "20 deaths decreased" (Expand Search), "_ means decrease" (Expand Search), "k means decrease" (Expand Search), "a means decrease" (Expand Search)
"50 ng decrease" » "50 nn decrease" (Expand Search), "50 we decrease" (Expand Search), "50 gy decreased" (Expand Search), "50 mg decrease" (Expand Search), "10 ng decrease" (Expand Search), "5 ng decrease" (Expand Search)
"50 a decrease" » "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ decrease" (Expand Search), "50 c decrease" (Expand Search), "5 a 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 a decrease") OR ("20 means decrease"))) OR ("50 ng decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 _ decrease\") OR (((((\"50 a decrease\") OR (\"20 means decrease\"))) OR (\"50 ng decrease\"))))".
• Removing quotes may allow a broader search: (( 50 _ decrease ) OR ((((( 50 a decrease ) OR ( 20 means decrease ))) OR ( 50 ng decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("50 _ decrease") OR ((((("50 a decrease") OR ("20 means decrease"))) OR ("50 ng decrease"))))*.