Perhaps you should try some spelling variations:
significantly weaker » significantly greater (Expand Search), significantly better (Expand Search), significantly related (Expand Search)
significantly longer » significantly lower (Expand Search), significantly larger (Expand Search), significantly higher (Expand Search)
weaker decrease » greater decrease (Expand Search), teer decrease (Expand Search), water decreases (Expand Search)
longer decrease » larger decrease (Expand Search), linear decrease (Expand Search), largest decrease (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 longer decrease )).