Perhaps you should try some spelling variations:
significant level » significance level (Expand Search), significance levels (Expand Search), significant gender (Expand Search)
level decrease » levels decreased (Expand Search), level increased (Expand Search), teer decrease (Expand Search)
lower decrease » larger decrease (Expand Search), linear decrease (Expand Search), teer decrease (Expand Search)
we decrease » _ decrease (Expand Search), a decrease (Expand Search), nn 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: "\"((\\"significant level decrease\\") OR (\\"significantly ((lower decrease) OR (we decrease))\\"))\"".
• Removing quotes may allow a broader search: (( significant level decrease ) OR ( significantly ((lower decrease) OR (we decrease)) )).