Talvez deva tentar algumas variações de ortografia:
decrease irrigation » increased irrigation (Expandir a busca), reuse irrigation (Expandir a busca), decrease migration (Expandir a busca)
irrigation method » irrigation methods (Expandir a busca), propagation method (Expandir a busca), irrigation depths (Expandir a busca)
roads decrease » foods decreases (Expandir a busca), goods decreases (Expandir a busca), rate decrease (Expandir a busca)
python coding » action coding (Expandir a busca), python code (Expandir a busca)
coding python » codigo python (Expandir a busca), codigos python (Expandir a busca), using python (Expandir a busca)
python python » pythons python (Expandir a busca), piton python (Expandir a busca), pitons python (Expandir a busca)
code roads » side roads (Expandir a busca), cost roads (Expandir a busca), closed roads (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( code roads decrease irrigation method ) OR ( python coding python python programming ))~.