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