Perhaps you should try some spelling variations:
"helped decrease" » "helped decreased" (Expand Search), "helped increase" (Expand Search)
"teer decrease" » "teer decreased" (Expand Search), "teer increase" (Expand Search), "steer decrease" (Expand Search), "peer decrease" (Expand Search), "meer decrease" (Expand Search)
"greater decrease" » "greater decreased" (Expand Search), "greater increase" (Expand Search)
"mean decrease" » "mean decreased" (Expand Search), "mean 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: "((\"helped decrease\") OR (((((\"teer decrease\") OR (\"greater decrease\"))) OR (\"mean decrease\"))))~".
• Removing quotes may allow a broader search: (( helped decrease ) OR ((((( teer decrease ) OR ( greater decrease ))) OR ( mean decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("helped decrease") OR ((((("teer decrease") OR ("greater decrease"))) OR ("mean decrease"))))*.