Perhaps you should try some spelling variations:
"5 ppm decrease" » "5 ppm decreased" (Expand Search), "5 ppm increase" (Expand Search)
"5 _ decrease" » "5 _ decreased" (Expand Search), "5 _ increase" (Expand Search)
"a point decrease" » "a point decreased" (Expand Search), "a point increase" (Expand Search)
"_ point decrease" » "_ point decreased" (Expand Search), "_ point increase" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"5 ppm decrease\") OR (((((\"5 _ decrease\") OR (\"a point decrease\"))) OR (\"_ point decrease\"))))~".
• Removing quotes may allow a broader search: (( 5 ppm decrease ) OR ((((( 5 _ decrease ) OR ( a point decrease ))) OR ( _ point decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("5 ppm decrease") OR ((((("5 _ decrease") OR ("a point decrease"))) OR ("_ point decrease"))))*.