Perhaps you should try some spelling variations:
"50 ppm decrease" » "50 _ decrease" (Expand Search)
"5 wt decrease" » "5 _ decrease" (Expand Search), "_ wt decrease" (Expand Search), "5 ht decrease" (Expand Search), "2 wt decrease" (Expand Search)
"_ we decrease" » "_ _ decrease" (Expand Search), "_ web decrease" (Expand Search), "_ e decrease" (Expand Search), "_ fe decrease" (Expand Search)
"50 i decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "10 i decrease" (Expand Search), "5 i 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: (((("50 ppm decrease") OR ((("5 wt decrease") OR ("_ we decrease"))))) OR ("50 i decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 ppm decrease\") OR (((\"5 wt decrease\") OR (\"_ we decrease\"))))) OR (\"50 i decrease\"))".
• Removing quotes may allow a broader search: (((( 50 ppm decrease ) OR ((( 5 wt decrease ) OR ( _ we decrease ))))) OR ( 50 i decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 ppm decrease") OR ((("5 wt decrease") OR ("_ we decrease"))))) OR ("50 i decrease"))*.