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