Perhaps you should try some spelling variations:
decrease birth » decrease with (Expand search), decrease its (Expand search), decrease high (Expand search)
birth process » death process (Expand search)
python python » pythons python (Expand search), piton python (Expand search), pitons python (Expand search)
decrease can » decrease in (Expand search), decrease and (Expand search), decrease at (Expand search)
can decrease » and decrease (Expand search), can increase (Expand search), to 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: "(( decrease can decrease birth process ) OR ( python _ python python programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease can decrease birth process ) OR ( python _ python python programming ))*.