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 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)
"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)

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 _ decrease\") OR (((((\"50 c decrease\") OR (\"50 a decrease\"))) OR (\"10 ng decrease\"))))~".
• Removing quotes may allow a broader search: (( 50 _ decrease ) OR ((((( 50 c decrease ) OR ( 50 a decrease ))) OR ( 10 ng decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("50 _ decrease") OR ((((("50 c decrease") OR ("50 a decrease"))) OR ("10 ng decrease"))))*.