Perhaps you should try some spelling variations:
"significantly greater decrease" » "significantly correlated decrease" (Expand Search), "significantly increased decrease" (Expand Search), "significantly higher decrease" (Expand Search), "significantly greatest decrease" (Expand Search), "significantly greater increase" (Expand Search), "significantly greater disease" (Expand Search)
"significant level decrease" » "significance level decrease" (Expand Search), "significance levels decrease" (Expand Search), "significant gender decrease" (Expand Search), "significant levels decreased" (Expand Search), "significant level increased" (Expand Search), "significant teer 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 greater decrease\"))~".
• Removing quotes may allow a broader search: (( significant level decrease ) OR ( significantly greater decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (("significant level decrease") OR ("significantly greater decrease"))*.