Perhaps you should try some spelling variations:
"10 ng decrease" » "10 nn decrease" (Expand Search), "10 we decrease" (Expand Search), "10 gy decreased" (Expand Search), "100 ng decrease" (Expand Search), "10 mg decrease" (Expand Search), "10 nm decrease" (Expand Search)
"50 a decrease" » "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ decrease" (Expand Search), "5 a decrease" (Expand Search), "0 a decrease" (Expand Search)
"50 c decrease" » "50 c decreased" (Expand Search), "50 rc decreased" (Expand Search), "50 _ decreased" (Expand Search), "5 c decrease" (Expand Search), "50 μ decrease" (Expand Search), "20 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 a decrease\") OR (\"50 _ decrease\"))) OR (\"10 ng decrease\"))) OR (\"50 c decrease\"))~".
• Removing quotes may allow a broader search: (((((( 50 a decrease ) OR ( 50 _ decrease ))) OR ( 10 ng decrease ))) OR ( 50 c decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (((((("50 a decrease") OR ("50 _ decrease"))) OR ("10 ng decrease"))) OR ("50 c decrease"))*.