Talvez deva tentar algumas variações de ortografia:
populations using » formulations using (Expandir a busca), populations and (Expandir a busca)
locking pitons » loading pistons (Expandir a busca)
purse program » pure program (Expandir a busca), course program (Expandir a busca), purchase program (Expandir a busca)
using locking » using docking (Expandir a busca), using stacking (Expandir a busca), using tracking (Expandir a busca)
using purse » using pure (Expandir a busca), using pulse (Expandir a busca), using parse (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( AND populations using purse program ) OR ( using locking pitons python programming ))*.