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