Talvez deva tentar algumas variações de ortografia:
pathogen challenge » nitrogen challenge (Expandir a busca), antigen challenge (Expandir a busca), cariogenic challenge (Expandir a busca)
challenge based » challenge and (Expandir a busca)
coder python » codigo python (Expandir a busca), compra python (Expandir a busca)
based python » based path (Expandir a busca), and python (Expandir a busca), gate python (Expandir a busca)
coder coder » coder decoder (Expandir a busca), code code (Expandir a busca), decoder codec (Expandir a busca)
python code » python coding (Expandir a busca), python redes (Expandir a busca)
code python » codigo python (Expandir a busca), pacote python (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( coder coder python code python ) OR ( pathogen challenge based python programming ))~.