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