Perhaps you should try some spelling variations:
"5 ppm decrease" » "5 _ decrease" (Expand Search)
"_ ca2 decrease" » "_ _ decrease" (Expand Search), "_ co2 decrease" (Expand Search), "_ cam decrease" (Expand Search), "_ car decrease" (Expand Search)
"5 nm decrease" » "5 _ decrease" (Expand Search), "6 nm decrease" (Expand Search)
"3d point decrease" » "_ point decrease" (Expand Search), "a point 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: (("5 ppm decrease") OR ((((("_ ca2 decrease") OR ("5 nm decrease"))) OR ("3d point decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"5 ppm decrease\") OR (((((\"_ ca2 decrease\") OR (\"5 nm decrease\"))) OR (\"3d point decrease\"))))".
• Removing quotes may allow a broader search: (( 5 ppm decrease ) OR ((((( _ ca2 decrease ) OR ( 5 nm decrease ))) OR ( 3d point decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("5 ppm decrease") OR ((((("_ ca2 decrease") OR ("5 nm decrease"))) OR ("3d point decrease"))))*.