Talvez deva tentar algumas variações de ortografia:
vpython programming » python programming (Expandir a busca), method programming (Expandir a busca), creation programming (Expandir a busca)
defense processes » defense process (Expandir a busca), decrease processes (Expandir a busca), disease processes (Expandir a busca)
decrease defense » defense defense (Expandir a busca), decrease release (Expandir a busca), decreases disease (Expandir a busca)
roads decrease » foods decreases (Expandir a busca), goods decreases (Expandir a busca), rate decrease (Expandir a busca)
models vpython » modeling vpython (Expandir a busca), modulo python (Expandir a busca)
action based » reaction based (Expandir a busca), function based (Expandir a busca)
based models » based model (Expandir a busca), mixed models (Expandir a busca)
code roads » side roads (Expandir a busca), cost roads (Expandir a busca), closed roads (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( code roads decrease defense processes ) OR ( action based models vpython programming ))~.