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