Perhaps you should try some spelling variations:
"50 nn decrease" » "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 gy decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 n decrease" (Expand Search)
"10 ng decrease" » "10 a decrease" (Expand Search), "10 we decrease" (Expand Search), "10 gy decreased" (Expand Search), "100 ng decrease" (Expand Search), "10 mg decrease" (Expand Search), "10 nm decrease" (Expand Search)
"5 ng decrease" » "5 a decrease" (Expand Search), "5 we decrease" (Expand Search), "5 gy decreased" (Expand Search), "5 mg decrease" (Expand Search), "5 g decrease" (Expand Search), "5 nm 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 _ decrease") OR ("50 nn decrease"))) OR ((("10 ng decrease") OR ("5 ng decrease"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 _ decrease\") OR (\"50 nn decrease\"))) OR (((\"10 ng decrease\") OR (\"5 ng decrease\"))))".
• Removing quotes may allow a broader search: (((( 50 _ decrease ) OR ( 50 nn decrease ))) OR ((( 10 ng decrease ) OR ( 5 ng decrease )))).
• Adding a wildcard symbol may retrieve word variants: (((("50 _ decrease") OR ("50 nn decrease"))) OR ((("10 ng decrease") OR ("5 ng decrease"))))*.