Perhaps you should try some spelling variations:
period programming » end programming (Expand search), learning programming (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)
methods period » methods derived (Expand search), methods perform (Expand search), methods method (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 AND methods period programming ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease OR decrease decrease processes ) OR ( python AND methods period programming ))*.