Talvez debería tentar con algunhas variantes ortográficas:
crest derived » host derived (Expandir procura)
level rather » levels rather (Expandir procura), level rates (Expandir procura), level race (Expandir procura)
derived th1 » derived thin (Expandir procura), derived tgf (Expandir procura), derived tnf (Expandir procura)
doses level » does level (Expandir procura), dose levels (Expandir procura), bones level (Expandir procura)
drug crest » drug cross (Expandir procura), drug crystal (Expandir procura)
level ther » level theory (Expandir procura), levels other (Expandir procura), level three (Expandir procura)
dose level » dose levels (Expandir procura), noise level (Expandir procura), dose live (Expandir procura)
drug dose » drug dosage (Expandir procura)

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 crest derived th1 ) or ((( drug doses level ther ) or ( drug dose level rather ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( drug crest derived th1 ) OR ((( drug doses level ther ) OR ( drug dose level rather )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( drug crest derived th1 ) or ((( drug doses level ther ) or ( drug dose level rather ))))*.