Perhaps you should try some spelling variations:
"50 pp decrease" » "50 _ decrease" (Expand Search)
"5 nn decrease" » "5 _ decrease" (Expand Search), "k nn decrease" (Expand Search), "_ nn decrease" (Expand Search)
"10 a decrease" » "10 _ decrease" (Expand Search), "10 _ decreased" (Expand Search), "10 _ decreases" (Expand Search), "1 a decrease" (Expand Search), "10 i decrease" (Expand Search)
"19 a decrease" » "19 _ decrease" (Expand Search), "19 _ decreased" (Expand Search), "19 _ decreases" (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 pp decrease") OR ((((("10 a decrease") OR ("19 a decrease"))) OR ("5 nn decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 pp decrease\") OR (((((\"10 a decrease\") OR (\"19 a decrease\"))) OR (\"5 nn decrease\"))))".
• Removing quotes may allow a broader search: (( 50 pp decrease ) OR ((((( 10 a decrease ) OR ( 19 a decrease ))) OR ( 5 nn decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("50 pp decrease") OR ((((("10 a decrease") OR ("19 a decrease"))) OR ("5 nn decrease"))))*.