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 weaker decrease" » "significantly greater decrease" (Expand Search), "significantly better decrease" (Expand Search), "significantly related decrease" (Expand Search), "significantly teer decrease" (Expand Search), "significantly water decreases" (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 weaker decrease\") OR (\"significantly smaller decrease\"))~".
• Removing quotes may allow a broader search: (( significantly weaker decrease ) OR ( significantly smaller decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (("significantly weaker decrease") OR ("significantly smaller decrease"))*.