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