Talvez deva tentar algumas variações de ortografia:
ventral serve » ventral nerve (Expandir a Pesquisa), central server (Expandir a Pesquisa), central service (Expandir a Pesquisa)
helper serve » help preserve (Expandir a Pesquisa), helper free (Expandir a Pesquisa), helper gene (Expandir a Pesquisa)
benign serum » benign serous (Expandir a Pesquisa), benign struma (Expandir a Pesquisa), design serum (Expandir a Pesquisa)
ii ventral » i ventral (Expandir a Pesquisa), a ventral (Expandir a Pesquisa), 2 ventral (Expandir a Pesquisa)
serve cat » nerve cat (Expandir a Pesquisa), serve a (Expandir a Pesquisa), service cats (Expandir a Pesquisa)
serve can » nerve can (Expandir a Pesquisa), merve can (Expandir a Pesquisa), service can (Expandir a Pesquisa)
serum cat » serum ca (Expandir a Pesquisa), serum can (Expandir a Pesquisa), serum ca19 (Expandir a Pesquisa)
a helper » _ helper (Expandir a Pesquisa)
j benign » j benigno (Expandir a Pesquisa), a benign (Expandir a Pesquisa), 1 benign (Expandir a Pesquisa)
cat dis » cat did (Expandir a Pesquisa), cat diets (Expandir a Pesquisa), cat diet (Expandir a Pesquisa)
can dcs » can tdcs (Expandir a Pesquisa), can dce (Expandir a Pesquisa), can dags (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: (((( a helper serve cat dis ) or ( ii ventral serve can dcs ))) or ( j benign serum cat dis ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( a helper serve cat dis ) OR ( ii ventral serve can dcs ))) OR ( j benign serum cat dis ))*.