Perhaps you should try some spelling variations:
most complex » most complete (Expand Search), coat complex (Expand Search), cst complex (Expand Search)
complex tail » complex task (Expand Search), complex thin (Expand Search), complex tap (Expand Search)
kcl carlos » akel carlos (Expand Search), gil carlos (Expand Search), del carlos (Expand Search)
carlos now » carlos noe (Expand Search), carlos noa (Expand Search), carlos novo (Expand Search)
como note » como norte (Expand Search), como mote (Expand Search), como nome (Expand Search)
al campo » el campo (Expand Search), del campo (Expand Search), al cambio (Expand Search)
tail new » hail new (Expand Search), retail new (Expand Search), grail new (Expand Search)
3 nacl » _ nacl (Expand Search), 3.5 nacl (Expand Search)
j al » j a (Expand Search), j l (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 al campo como note ) OR ((( a most complex tail new ) OR ( 3 nacl kcl carlos now ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j al campo como note ) or ((( a most complex tail new ) or ( 3 nacl kcl carlos now ))))*.