Perhaps you should try some spelling variations:
"decrease greatly reduce" » "decrease greatly reduces" (Expand Search)
"decrease greatly reduced" » "decrease greatly reducesd" (Expand Search)
"increase can reduce" » "increase cbf reduce" (Expand Search), "increase a reduce" (Expand Search), "increased cn reduce" (Expand Search), "increase may reduce" (Expand Search), "increase can induce" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("decrease greatly reduce") OR ("decrease greatly reduced"))) OR ("increase can reduce"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"decrease greatly reduce\") OR (\"decrease greatly reduced\"))) OR (\"increase can reduce\"))*".
• Removing quotes may allow a broader search: (((( decrease greatly reduce ) OR ( decrease greatly reduced ))) OR ( increase can reduce ))*.