Perhaps you should try some spelling variations:
complex trial » complex atrial (Expand Search), complex tibial (Expand Search), complex tropical (Expand Search)
nano complex » nano complexes (Expand Search), lato complex (Expand Search), nanocomplex _ (Expand Search)
comunes son » comunes sin (Expand Search), comunes con (Expand Search), comunes usos (Expand Search)
nino carlos » cano carlos (Expand Search), bacino carlos (Expand Search), semino carlos (Expand Search)
carlos nara » carlos lara (Expand Search), carlos nava (Expand Search), carlos jara (Expand Search)
y comunes » y comuneros (Expand Search), y comunales (Expand Search), de comunes (Expand Search)
trial nit » trial nct (Expand Search), trials unit (Expand Search), trial units (Expand Search)
son net » son nt (Expand Search), son n.t (Expand Search), con net (Expand Search)
5 nano » 15 nano (Expand Search), e nano (Expand Search)
k nino » e nino (Expand Search), k nijo (Expand Search), k nina (Expand Search)
7.2 k » 7.2 _ (Expand Search), 4.2 k (Expand Search), 1.2 k (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 y comunes son net ) OR ((( 5 nano complex trial nit ) OR ( 7.2 k nino carlos nara ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j y comunes son net ) or ((( 5 nano complex trial nit ) or ( 7.2 k nino carlos nara ))))*.