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