Perhaps you should try some spelling variations:
decrease complex » disease complex (Expand search), decreased compared (Expand search), protease complex (Expand search)
complex problems » complex projects (Expand search)
python based » action based (Expand search)
based pitons » based peptones (Expand search), based epitope (Expand search), based tectons (Expand search)
decrease of » decrease in (Expand search)
of decrease » or decrease (Expand search), not decrease (Expand search), to decrease (Expand search)

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

• Removing quotes may allow a broader search: (( decrease of decrease complex problems ) OR ( python based pitons python programming ))~.