Perhaps you should try some spelling variations:
vaccination programa » vaccination program (Expand search), vaccination programs (Expand search), vaccination programme (Expand search)
method vaccination » method validation (Expand search), method variation (Expand search), without vaccination (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)
decrease at » decrease akt (Expand search), decrease and (Expand search), decrease in (Expand search)
at decrease » rate decrease (Expand search), that decrease (Expand search), and decrease (Expand search)
python and » python based (Expand search)
and method » and methods (Expand search), based method (Expand search)

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( decrease at decrease decrease processes ) OR ( python AND method vaccination programa ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease at decrease decrease processes ) OR ( python and method vaccination programa ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease at decrease decrease processes ) OR ( python and method vaccination programa ))*.