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