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