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