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