Talvez deva tentar algumas variações de ortografia:
variability problems » reliability problems (Expandir a busca), stability problems (Expandir a busca), usability problems (Expandir a busca)
scale variability » space variability (Expandir a busca), rate variability (Expandir a busca), the variability (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
code scale » core scale (Expandir a busca), cope scale (Expandir a busca), care scale (Expandir a busca)
python api » python and (Expandir a busca)
code code » code cdc (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( code code scale variability problems ) OR ( python api python python programming ))~.