Perhaps you should try some spelling variations:
drug complexes » drug companies (Expand Search), igg complexes (Expand Search)
a.c comparando » e comparando (Expand Search), ldl comparando (Expand Search)
comparando las » comparando la (Expand Search), comparando duas (Expand Search), comparando os (Expand Search)
complexes v » complexes _ (Expand Search), complexes a (Expand Search), complexes 1 (Expand Search)
campo con » campo como (Expand Search), campo c (Expand Search)
con note » con notas (Expand Search)
l campo » el campo (Expand Search), al campo (Expand Search), l campos (Expand Search)
las now » has now (Expand Search), atlas now (Expand Search), gaps now (Expand Search)
n drug » n druga (Expand Search), n drugs (Expand Search), n drum (Expand Search)
v ngoc » vu ngoc (Expand Search), vo ngoc (Expand Search), _ ngoc (Expand Search)
35 a.c » 355 a.c (Expand Search), 350 a.c (Expand Search), 385 a.c (Expand Search)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( j l campo con note ) OR ((( n drug complexes v ngoc ) OR ( 35 a.c comparando las now ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j l campo con note ) or ((( n drug complexes v ngoc ) or ( 35 a.c comparando las now ))))*.