Perhaps you should try some spelling variations:
"50 ms decrease" » "50 _ decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 mg decrease" (Expand Search)
"50 mm decrease" » "50 _ decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 we decrease" (Expand Search), "50 mg decrease" (Expand Search), "10 mm decrease" (Expand Search), "20 mm 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)

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 mm decrease\"))) OR (\"50 a decrease\"))~".
• Removing quotes may allow a broader search: (((( 50 ms decrease ) OR ( 50 mm decrease ))) OR ( 50 a decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (((("50 ms decrease") OR ("50 mm decrease"))) OR ("50 a decrease"))*.