Talvez deva tentar algumas variações de ortografia:
introduction python » introduction section (Expandir a busca), introduction earthen (Expandir a busca), introduction methods (Expandir a busca)
prevention vector » prevention factor (Expandir a busca), prevention factors (Expandir a busca), prevention center (Expandir a busca)
coder prevention » cancer prevention (Expandir a busca), soccer prevention (Expandir a busca), ulcer prevention (Expandir a busca)
and introduction » an introduction (Expandir a busca)
coding program » cloning program (Expandir a busca), loading program (Expandir a busca), cooling programs (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Caso esteja tentando utilizar os operadores booleanos, deve escrevê-los em Letras MAIÚSCULAS: (( coder prevention vector coding program ) OR ( AND introduction python python programming ))~.
• As palavras AND, OR e NOT pode ocasionar problemas na busca; tente utilizar as aspas: "(( coder prevention vector coding program ) OR ( and introduction python python programming ))~".
• Adicionar um caractere curinga pode recuperar variações da palavra buscada: (( coder prevention vector coding program ) OR ( and introduction python python programming ))*.