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