Talvez deva tentar algumas variações de ortografia:
errors decrease » lesions decrease (Expandir a busca), tumors decreased (Expandir a busca)
decrease based » decreased base (Expandir a busca), decrease blood (Expandir a busca)
sample errors » sampling errors (Expandir a busca), sample effort (Expandir a busca)
python codigo » python coding (Expandir a busca), python code (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.

• Remover as aspas pode possibilitar buscas mais amplas: (( sample errors decrease based program ) OR ( python codigo python python programming ))~.