Perhaps you should try some spelling variations:
decrease further » increase further (Expand search), disease further (Expand search), decrease the (Expand search)
further decrease » further increase (Expand search), faster decrease (Expand search), the decrease (Expand search)
that decrease » that increase (Expand search), that increases (Expand search), not decrease (Expand search)
in problems » in problem (Expand search), on problems (Expand search), open problems (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), to decrease (Expand search)
trees that » tree that (Expand search), trees at (Expand search), trees the (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: "(( decrease further decrease in problems ) OR ( trees that decrease of decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease further decrease in problems ) OR ( trees that decrease of decrease ))*.