Perhaps you should try some spelling variations:
"5 we decrease" » "5 _ decrease" (Expand Search), "5 nn decrease" (Expand Search), "5 mean decrease" (Expand Search), "_ we decrease" (Expand Search), "5 wt decrease" (Expand Search), "5 w decrease" (Expand Search)
"5 nm decrease" » "5 nn decrease" (Expand Search), "5 _ decrease" (Expand Search), "5 gy decreased" (Expand Search), "5 mm decrease" (Expand Search), "5 cm decrease" (Expand Search)
"50 a decrease" » "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 _ decreases" (Expand Search), "50 μ decrease" (Expand Search), "50 c decrease" (Expand Search)
"50 n decrease" » "50 nn decrease" (Expand Search), "50 _ decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 μ decrease" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("50 a decrease") OR ((("5 we decrease") OR ("5 nm decrease"))))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 a decrease\") OR (((\"5 we decrease\") OR (\"5 nm decrease\"))))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((( 50 a decrease ) OR ((( 5 we decrease ) OR ( 5 nm decrease ))))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 a decrease") OR ((("5 we decrease") OR ("5 nm decrease"))))) OR ("50 n decrease"))*.