Perhaps you should try some spelling variations:
"_ fed decrease" » "_ _ decrease" (Expand Search), "_ feed decrease" (Expand Search), "_ ed decrease" (Expand Search)
"5 ng decrease" » "5 _ decrease" (Expand Search), "5 g decrease" (Expand Search), "5 μg 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)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("5 ng decrease") OR ((((("_ fe decrease") OR ("_ fed decrease"))) OR ("5 a decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"5 ng decrease\") OR (((((\"_ fe decrease\") OR (\"_ fed decrease\"))) OR (\"5 a decrease\"))))".
• Removing quotes may allow a broader search: (( 5 ng decrease ) OR ((((( _ fe decrease ) OR ( _ fed decrease ))) OR ( 5 a decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("5 ng decrease") OR ((((("_ fe decrease") OR ("_ fed decrease"))) OR ("5 a decrease"))))*.