Perhaps you should try some spelling variations:
"helped decrease" » "helped decreased" (Expand Search), "helped increase" (Expand Search)
"helper decrease" » "helper decreased" (Expand Search), "helper increase" (Expand Search)
"greater decrease" » "greater decreased" (Expand Search), "greater 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)

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 (\"helper decrease\"))) OR (((\"greater decrease\") OR (\"teer decrease\"))))~".
• Removing quotes may allow a broader search: (((( helped decrease ) OR ( helper decrease ))) OR ((( greater decrease ) OR ( teer decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("helped decrease") OR ("helper decrease"))) OR ((("greater decrease") OR ("teer decrease"))))*.