Perhaps you should try some spelling variations:
"50 ng decrease" » "50 _ decrease" (Expand Search), "50 μg decrease" (Expand Search)
"10 ng decrease" » "10 _ decrease" (Expand Search), "100 ng decrease" (Expand Search), "10 μg decrease" (Expand Search)
"_ e decrease" » "_ _ decrease" (Expand Search), "_ _ decreased" (Expand Search), "_ _ decreases" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "5 a decrease" (Expand Search), "50 i decrease" (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 ("10 ng decrease"))) OR ("_ e decrease"))) OR ("50 a decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 ng decrease\") OR (\"10 ng decrease\"))) OR (\"_ e decrease\"))) OR (\"50 a decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 ng decrease ) OR ( 10 ng decrease ))) OR ( _ e decrease ))) OR ( 50 a decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 ng decrease") OR ("10 ng decrease"))) OR ("_ e decrease"))) OR ("50 a decrease"))*.