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