Perhaps you should try some spelling variations:
"50 nggn decrease" » "50 mean decrease" (Expand Search), "50 mggn decrease" (Expand Search), "10 nggn decrease" (Expand Search), "5 nggn decrease" (Expand Search)
"50 ngn decrease" » "50 mean decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mgn decrease" (Expand Search), "10 ngn decrease" (Expand Search), "5 ngn decrease" (Expand Search)
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 ns decrease" (Expand Search), "50 n decrease" (Expand Search), "59 nn decrease" (Expand Search)
"50 ng decrease" » "50 _ 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 nggn decrease"))) OR ("50 nn decrease"))) OR ("50 ng decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"50 ngn decrease\") OR (\"50 nggn decrease\"))) OR (\"50 nn decrease\"))) OR (\"50 ng decrease\"))".
• Removing quotes may allow a broader search: (((((( 50 ngn decrease ) OR ( 50 nggn decrease ))) OR ( 50 nn decrease ))) OR ( 50 ng decrease )).
• Adding a wildcard symbol may retrieve word variants: (((((("50 ngn decrease") OR ("50 nggn decrease"))) OR ("50 nn decrease"))) OR ("50 ng decrease"))*.