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