Talvez deva tentar algumas variações de ortografia:
vpython collisions » vpython colisoes (Expandir a busca), proton collisions (Expandir a busca), photon collisions (Expandir a busca)
collisions python » collisions within (Expandir a busca), collisions with (Expandir a busca), collisions on (Expandir a busca)
case processes » care processes (Expandir a busca), caso processes (Expandir a busca), cases processed (Expandir a busca)
diseases case » disease case (Expandir a busca), diseases care (Expandir a busca), diseases caused (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
in diseases » in disease (Expandir a busca), skin diseases (Expandir a busca), and diseases (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• As palavras AND, OR e NOT pode ocasionar problemas na busca; tente utilizar as aspas: "(( decrease in diseases case processes ) OR ( vpython collisions python python programming ))~".
• Adicionar um caractere curinga pode recuperar variações da palavra buscada: (( decrease in diseases case processes ) OR ( vpython collisions python python programming ))*.