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