Perhaps you should try some spelling variations:
"50 pp decrease" » "50 _ decrease" (Expand Search)
"_ nn decrease" » "_ _ decrease" (Expand Search), "_ ann decrease" (Expand Search), "_ cnn decrease" (Expand Search), "_ knn 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)
"5 fold decrease" » "_ fold 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 a decrease") OR ((("_ nn decrease") OR ("5 fold decrease"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 pp decrease\") OR (((\"50 a decrease\") OR (((\"_ nn decrease\") OR (\"5 fold decrease\"))))))*".
• Removing quotes may allow a broader search: (( 50 pp decrease ) OR ((( 50 a decrease ) OR ((( _ nn decrease ) OR ( 5 fold decrease ))))))*.