Perhaps you should try some spelling variations:
"50 pp decrease" » "50 _ decrease" (Expand Search)
"50 cs decrease" » "50 _ decrease" (Expand Search)
"50 ng decrease" » "50 _ decrease" (Expand Search), "10 ng decrease" (Expand Search), "50 μg decrease" (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)

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 ((((("50 cs decrease") OR ("50 ng decrease"))) OR ("50 a decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 pp decrease\") OR (((((\"50 cs decrease\") OR (\"50 ng decrease\"))) OR (\"50 a decrease\"))))*".
• Removing quotes may allow a broader search: (( 50 pp decrease ) OR ((((( 50 cs decrease ) OR ( 50 ng decrease ))) OR ( 50 a decrease ))))*.