Talvez deva tentar algumas variações de ortografia:
covert disease » overt disease (Expandir a Pesquisa), cover disease (Expandir a Pesquisa), poverty disease (Expandir a Pesquisa)
disease newly » disease new (Expandir a Pesquisa), disease newer (Expandir a Pesquisa), disease news (Expandir a Pesquisa)
complex trait » complex traits (Expandir a Pesquisa)
company years » company year (Expandir a Pesquisa), company cars (Expandir a Pesquisa), comparing years (Expandir a Pesquisa)
nacl company » nail company (Expandir a Pesquisa), rail company (Expandir a Pesquisa), parcel company (Expandir a Pesquisa)
nar complex » par complex (Expandir a Pesquisa), far complex (Expandir a Pesquisa), tar complex (Expandir a Pesquisa)
trait ngo » trait co (Expandir a Pesquisa)
3 nacl » _ nacl (Expandir a Pesquisa), m nacl (Expandir a Pesquisa), 3.5 nacl (Expandir a Pesquisa)
5 nar » _ nar (Expandir a Pesquisa), 5 nor (Expandir a Pesquisa), 5 ntr (Expandir a Pesquisa)
how » show (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 _ covert disease newly ) or ((( 5 nar complex trait ngo ) or ( 3 nacl company years how ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ covert disease newly ) OR ((( 5 nar complex trait ngo ) OR ( 3 nacl company years how )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ covert disease newly ) or ((( 5 nar complex trait ngo ) or ( 3 nacl company years how ))))*.