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 impacter decrease" (Expand Search), "significantly impairer decrease" (Expand Search), "significantly varyer decrease" (Expand Search), "significantly marked decrease" (Expand Search), "significantly smaller areas" (Expand Search), "significantly larger decrease" (Expand Search)
"significantly small decrease" » "significantly impact decrease" (Expand Search), "significantly impair decrease" (Expand Search), "significantly vary decrease" (Expand Search), "significantly small increased" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("significantly small decrease") OR ("significantly smaller decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"significantly small decrease\") OR (\"significantly smaller decrease\"))*".
• Removing quotes may allow a broader search: (( significantly small decrease ) OR ( significantly smaller decrease ))*.