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