Perhaps you should try some spelling variations:
"50 ng decrease" » "50 _ decrease" (Expand Search), "10 ng decrease" (Expand Search), "50 μg decrease" (Expand Search)
"5 ht decrease" » "5 _ decrease" (Expand Search)
"_ eb decrease" » "_ _ decrease" (Expand Search), "_ web decrease" (Expand Search), "_ ebv decrease" (Expand Search), "_ ebm decrease" (Expand Search)
"_ e decrease" » "_ _ decrease" (Expand Search), "_ _ decreased" (Expand Search), "_ _ 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: (("50 ng decrease") OR ((("5 ht decrease") OR ((("_ e decrease") OR ("_ eb decrease"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 ng decrease\") OR (((\"5 ht decrease\") OR (((\"_ e decrease\") OR (\"_ eb decrease\"))))))".
• Removing quotes may allow a broader search: (( 50 ng decrease ) OR ((( 5 ht decrease ) OR ((( _ e decrease ) OR ( _ eb decrease )))))).
• Adding a wildcard symbol may retrieve word variants: (("50 ng decrease") OR ((("5 ht decrease") OR ((("_ e decrease") OR ("_ eb decrease"))))))*.