Perhaps you should try some spelling variations:
"5 ng decrease" » "5 _ decrease" (Expand Search), "5 g decrease" (Expand Search), "5 μg decrease" (Expand Search)
"_ wt decrease" » "_ _ decrease" (Expand Search)
"50 i decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "10 i decrease" (Expand Search), "5 i decrease" (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: "((((\"5 ng decrease\") OR (\"50 i decrease\"))) OR (((\"_ wt decrease\") OR (\"_ e decrease\"))))~".
• Removing quotes may allow a broader search: (((( 5 ng decrease ) OR ( 50 i decrease ))) OR ((( _ wt decrease ) OR ( _ e decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("5 ng decrease") OR ("50 i decrease"))) OR ((("_ wt decrease") OR ("_ e decrease"))))*.