Perhaps you should try some spelling variations:
"_ bed decrease" » "_ _ decrease" (Expand Search), "_ ben decrease" (Expand Search), "_ bid 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 wt decrease" » "5 _ decrease" (Expand Search), "_ wt decrease" (Expand Search), "5 ht decrease" (Expand Search), "2 wt decrease" (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 (((((\"_ fe decrease\") OR (\"_ bed decrease\"))) OR (\"5 wt decrease\"))))~".
• Removing quotes may allow a broader search: (( 5 ng decrease ) OR ((((( _ fe decrease ) OR ( _ bed decrease ))) OR ( 5 wt decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("5 ng decrease") OR ((((("_ fe decrease") OR ("_ bed decrease"))) OR ("5 wt decrease"))))*.