Talvez deva tentar algumas variações de ortografia:
level catheter » novel catheter (Expandir a Pesquisa), local catheter (Expandir a Pesquisa), metal catheter (Expandir a Pesquisa)
level theory » legal theory (Expandir a Pesquisa), model theory (Expandir a Pesquisa), cell theory (Expandir a Pesquisa)
olive rather » live rather (Expandir a Pesquisa), naive rather (Expandir a Pesquisa), olive rayer (Expandir a Pesquisa)
doses level » dose level (Expandir a Pesquisa), does level (Expandir a Pesquisa), dose levels (Expandir a Pesquisa)
naive level » five level (Expandir a Pesquisa), live level (Expandir a Pesquisa), negative level (Expandir a Pesquisa)
drug doses » drug dose (Expandir a Pesquisa), drug disease (Expandir a Pesquisa)
does olive » does live (Expandir a Pesquisa), does online (Expandir a Pesquisa), does motive (Expandir a Pesquisa)
drug does » drugs does (Expandir a Pesquisa), drug dose (Expandir a Pesquisa), drug de (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: (( drug doses level theory ) or ((( drug does olive rather ) or ( drug naive level catheter ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( drug doses level theory ) OR ((( drug does olive rather ) OR ( drug naive level catheter )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( drug doses level theory ) or ((( drug does olive rather ) or ( drug naive level catheter ))))*.