Perhaps you should try some spelling variations:
"5 ppm decrease" » "5 _ decrease" (Expand Search)
"50 pp decrease" » "50 _ decrease" (Expand Search)
"5 c decrease" » "5 _ decrease" (Expand Search), "5 _ decreased" (Expand Search), "5 _ decreases" (Expand Search), "45 c decrease" (Expand Search)
"25 c decrease" » "25 _ decrease" (Expand Search), "25 _ decreased" (Expand Search), "25 _ decreases" (Expand Search), "22 c decrease" (Expand Search), "2 c decrease" (Expand Search), "245 c 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 ((("5 c decrease") OR ("25 c decrease"))))) OR ("5 ppm decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 pp decrease\") OR (((\"5 c decrease\") OR (\"25 c decrease\"))))) OR (\"5 ppm decrease\"))*".
• Removing quotes may allow a broader search: (((( 50 pp decrease ) OR ((( 5 c decrease ) OR ( 25 c decrease ))))) OR ( 5 ppm decrease ))*.