Perhaps you should try some spelling variations:
significantly weaker » significantly greater (Expand Search), significantly better (Expand Search), significantly related (Expand Search)
weaker decrease » greater decrease (Expand Search), teer decrease (Expand Search), water decreases (Expand Search)
less decrease » mean decrease (Expand Search), teer decrease (Expand Search), we decrease (Expand Search)
a decrease » _ decrease (Expand Search), _ decreased (Expand Search), _ decreases (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: "\"((\\"significantly ((less decrease) OR (a decrease))\\") OR (\\"significantly weaker decrease\\"))\"".
• Removing quotes may allow a broader search: (( significantly ((less decrease) OR (a decrease)) ) OR ( significantly weaker decrease )).