Perhaps you should try some spelling variations:
complex trial » complex atrial (Expand Search), complex tibial (Expand Search), complex tropical (Expand Search)
comunes sin » comunes en (Expand Search), comunes un (Expand Search)
qmo complex » fmo complex (Expand Search), mo complex (Expand Search), sumo complex (Expand Search)
carlos jara » carlos lara (Expand Search), carlos carla (Expand Search), carlos juca (Expand Search)
kno carlos » knopf carlos (Expand Search), cano carlos (Expand Search), nino carlos (Expand Search)
y comunes » y comuneros (Expand Search), y comunales (Expand Search), de comunes (Expand Search)
trial nic » trial nit (Expand Search), trial nimh (Expand Search), trial nihr (Expand Search)
nacl kno » nacl nano (Expand Search), nacl en (Expand Search), nacl kcl (Expand Search)
sin net » sin nee (Expand Search), sin neo (Expand Search), span net (Expand Search)
5 qmo » 5 mo (Expand Search), 5 pmo (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.

• Performing a fuzzy search may retrieve terms with similar spellings: (( j y comunes sin net ) or ((( 5 qmo complex trial nic ) or ( 3.5 nacl kno carlos jara ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( j y comunes sin net ) OR ((( 5 qmo complex trial nic ) OR ( 3.5 nacl kno carlos jara )))).
• Adding a wildcard symbol may retrieve word variants: (( j y comunes sin net ) or ((( 5 qmo complex trial nic ) or ( 3.5 nacl kno carlos jara ))))*.