Perhaps you should try some spelling variations:
significantly weaker » significantly greater (Expand Search), significantly better (Expand Search), significantly related (Expand Search)
significantly small » significantly smaller (Expand Search), significantly impact (Expand Search), significantly impair (Expand Search)
weaker decrease » greater decrease (Expand Search), teer decrease (Expand Search), water decreases (Expand Search)
small decrease » small increased (Expand Search)

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

• Removing quotes may allow a broader search: (( significantly weaker decrease ) OR ( significantly small decrease )).