Perhaps you should try some spelling variations:
"50 cs decrease" » "50 a decrease" (Expand Search), "50 nn decrease" (Expand Search), "50 c decreased" (Expand Search), "50 cas decrease" (Expand Search), "50 c decrease" (Expand Search), "50 ms 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 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)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 _ decrease\") OR (\"50 cs decrease\"))) OR (((\"50 n decrease\") OR (\"50 _g decrease\"))))~".
• Removing quotes may allow a broader search: (((( 50 _ decrease ) OR ( 50 cs decrease ))) OR ((( 50 n decrease ) OR ( 50 _g decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("50 _ decrease") OR ("50 cs decrease"))) OR ((("50 n decrease") OR ("50 _g decrease"))))*.