Perhaps you should try some spelling variations:
disease progress » disease process (Expand search), disease progression (Expand search)
density python » density method (Expand search)
trees density » tree density (Expand search), green density (Expand search), treg density (Expand search)
python trees » python redes (Expand search), python atraves (Expand search), python tools (Expand search)
decrease of » decrease in (Expand search)
of diseases » of disease (Expand search)

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

• Removing quotes may allow a broader search: (( decrease of diseases disease progress ) OR ( python trees density python programming ))~.