Talvez deva tentar algumas variações de ortografia:
decrease immunization » disease immunisation (Expandir a busca), diseases immunization (Expandir a busca), dose immunization (Expandir a busca)
immunization program » immunization programs (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
and decrease » and decreases (Expandir a busca), and decreased (Expandir a busca), and increase (Expandir a busca)
python api » python and (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( code and decrease immunization program ) OR ( python api python python programming ))~.