Perhaps you should try some spelling variations:
"50 ms decrease" » "50 _ decrease" (Expand Search)
"50 ng decrease" » "50 _ decrease" (Expand Search), "10 ng decrease" (Expand Search), "50 μg decrease" (Expand Search)
"_ w_ decrease" » "_ _ decrease" (Expand Search), "_ _ decreased" (Expand Search), "_ _ decreases" (Expand Search), "_ wt decrease" (Expand Search), "_ we decrease" (Expand Search), "_ w decrease" (Expand Search)
"5 e decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 ms decrease\") OR (\"50 ng decrease\"))) OR (((\"5 e decrease\") OR (\"_ w_ decrease\"))))~".
• Removing quotes may allow a broader search: (((( 50 ms decrease ) OR ( 50 ng decrease ))) OR ((( 5 e decrease ) OR ( _ w_ decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("50 ms decrease") OR ("50 ng decrease"))) OR ((("5 e decrease") OR ("_ w_ decrease"))))*.