Talvez deva tentar algumas variações de ortografia:
sampling effect » sampling effort (Expandir a busca), sampling efforts (Expandir a busca), coupling effect (Expandir a busca)
effect decrease » effective decrease (Expandir a busca), effects increase (Expandir a busca), defects decrease (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
decrease phd » decrease the (Expandir a busca), decrease and (Expandir a busca), decreased ph (Expandir a busca)
phd program » and program (Expandir a busca), aid program (Expandir a busca), child program (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: (( sampling effect decrease phd program ) OR ( python code python python programming ))~.