Talvez deva tentar algumas variações de ortografia:
burden tax » burden than (Expandir a Pesquisa), burden a (Expandir a Pesquisa), burden tmb (Expandir a Pesquisa)
coli ccm » coli com (Expandir a Pesquisa), coli camp (Expandir a Pesquisa), coli can (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa), can new (Expandir a Pesquisa)
j pakula » j panula (Expandir a Pesquisa), j paula (Expandir a Pesquisa), j padulo (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (Expandir a Pesquisa)
ccm can » cam can (Expandir a Pesquisa), cm can (Expandir a Pesquisa), ecm can (Expandir a Pesquisa)
tax non » tax now (Expandir a Pesquisa)
j coli » j colin (Expandir a Pesquisa), j cole (Expandir a Pesquisa), j cola (Expandir a Pesquisa)
nacl 3 » nacl _ (Expandir a Pesquisa), nacl a (Expandir a Pesquisa), nacl e (Expandir a Pesquisa)
thin n » thin _ (Expandir a Pesquisa), thin a (Expandir a Pesquisa), within n (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: (( j coli ccm can near ) or ((( j pakula burden tax non ) or ( 3.5 nacl 3 thin n ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j coli ccm can near ) OR ((( j pakula burden tax non ) OR ( 3.5 nacl 3 thin n )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j coli ccm can near ) or ((( j pakula burden tax non ) or ( 3.5 nacl 3 thin n ))))*.