Perhaps you should try some spelling variations:
"50 nn decrease" » "50 mean decrease" (Expand Search), "50 gy decreased" (Expand Search), "50 b1 decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 n decrease" (Expand Search)
"5 cm decrease" » "5 c decreased" (Expand Search), "5 we decrease" (Expand Search), "5 gy decreased" (Expand Search), "5 mm decrease" (Expand Search), "5 c decrease" (Expand Search)
"50 a decrease" » "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ decrease" (Expand Search), "50 c decrease" (Expand Search), "5 a 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 a decrease") OR ((((("50 nn decrease") OR ("50 _ decrease"))) OR ("5 cm decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"50 a decrease\") OR (((((\"50 nn decrease\") OR (\"50 _ decrease\"))) OR (\"5 cm decrease\"))))".
• Removing quotes may allow a broader search: (( 50 a decrease ) OR ((((( 50 nn decrease ) OR ( 50 _ decrease ))) OR ( 5 cm decrease )))).
• Adding a wildcard symbol may retrieve word variants: (("50 a decrease") OR ((((("50 nn decrease") OR ("50 _ decrease"))) OR ("5 cm decrease"))))*.