Perhaps you should try some spelling variations:
"significantly related decrease" » "significantly correlated decrease" (Expand Search), "significantly elevated decrease" (Expand Search), "significantly reduced decrease" (Expand Search), "significantly reported decrease" (Expand Search), "significantly related disease" (Expand Search), "significantly greater decrease" (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 linear decrease\") OR (\"significantly related decrease\"))~".
• Removing quotes may allow a broader search: (( significantly linear decrease ) OR ( significantly related decrease ))~.
• Adding a wildcard symbol may retrieve word variants: (("significantly linear decrease") OR ("significantly related decrease"))*.