Talvez deva tentar algumas variações de ortografia:
methodology problems » methodology problem (Expandir a busca), methodology process (Expandir a busca), methodological problems (Expandir a busca)
clustering python » clustering method (Expandir a busca), clustering methods (Expandir a busca), clustering pattern (Expandir a busca)
motion surface » cotton surface (Expandir a busca), position surface (Expandir a busca), sorption surface (Expandir a busca)
and clustering » data clustering (Expandir a busca), _ clustering (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
coder motion » coder solution (Expandir a busca), proper motion (Expandir a busca), order motions (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Caso esteja tentando utilizar os operadores booleanos, deve escrevê-los em Letras MAIÚSCULAS: (( coder motion surface methodology problems ) OR ( AND clustering python python programming ))~.
• As palavras AND, OR e NOT pode ocasionar problemas na busca; tente utilizar as aspas: "(( coder motion surface methodology problems ) OR ( and clustering python python programming ))~".
• Adicionar um caractere curinga pode recuperar variações da palavra buscada: (( coder motion surface methodology problems ) OR ( and clustering python python programming ))*.