Talvez deva tentar algumas variações de ortografia:
skills compared » cells compared (Expandir a Pesquisa), trials compared (Expandir a Pesquisa), oils compared (Expandir a Pesquisa)
daily computer » daily computed (Expandir a Pesquisa), daily compared (Expandir a Pesquisa), ray computer (Expandir a Pesquisa)
computer based » computer aided (Expandir a Pesquisa)
nat company » salt company (Expandir a Pesquisa), a company (Expandir a Pesquisa), gas company (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa)
based no2 » based non (Expandir a Pesquisa), based noc (Expandir a Pesquisa), based nod (Expandir a Pesquisa)
company a » company _ (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), a nat (Expandir a Pesquisa)
a now » a non (Expandir a Pesquisa), _ now (Expandir a Pesquisa), a nos (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( _ daily computer based no2 ) or ((( _ skills compared a new ) or ( j nat company a now ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ daily computer based no2 ) OR ((( _ skills compared a new ) OR ( j nat company a now ))))*.