Perhaps you should try some spelling variations:
without variational » without additional (Expand search)
variational problem » variational problems (Expand search)
decrease processes » disease processes (Expand search), defense processes (Expand search), decay processes (Expand search)
decrease decrease » decrease release (Expand search), disease decreases (Expand search), decrease sucrose (Expand search)
based without » base without (Expand search), cases without (Expand search), case without (Expand search)
python based » action based (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 OR decrease decrease processes ) OR ( python based without variational problem ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease OR decrease decrease processes ) OR ( python based without variational problem ))*.