Perhaps you should try some spelling variations:
"significantly smaller decrease" » "significantly higher decrease" (Expand Search), "significantly lower decrease" (Expand Search), "significantly greater decrease" (Expand Search), "significantly small decrease" (Expand Search), "significantly marked decrease" (Expand Search), "significantly smaller areas" (Expand Search)
"significantly linear decrease" » "significant linear decrease" (Expand Search), "significantly lower decrease" (Expand Search), "significantly longer decrease" (Expand Search), "significantly linear increase" (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 smaller decrease\") OR (\"significantly linear decrease\"))~".
• Removing quotes may allow a broader search: (( significantly smaller decrease ) OR ( significantly linear decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (("significantly smaller decrease") OR ("significantly linear decrease"))*.