Perhaps you should try some spelling variations:
methoxy complex » methods complex (Expand Search), method complex (Expand Search), methanol complex (Expand Search)
complex tris » complex tric (Expand Search), complex trs (Expand Search), complex traits (Expand Search)
najar carlos » nejar carlos (Expand Search), nassar carlos (Expand Search), naja carlo (Expand Search)
nacl najar » al najar (Expand Search), nacl nabr (Expand Search)
carlos noa » carlos noe (Expand Search), carlos nodal (Expand Search), carlos nava (Expand Search)
comes con » comes can (Expand Search), comes down (Expand Search), comes joan (Expand Search)
tris ngo » trips ngo (Expand Search), tri ngo (Expand Search), trinh ngo (Expand Search)
l comes » l comps (Expand Search), l coles (Expand Search), l comas (Expand Search)
con net » con nee (Expand Search), non net (Expand Search), upon net (Expand Search)
3 nacl » _ nacl (Expand Search), 3.5 nacl (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 comes con net ) OR ((( 5 methoxy complex tris ngo ) OR ( 3 nacl najar carlos noa ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j l comes con net ) or ((( 5 methoxy complex tris ngo ) or ( 3 nacl najar carlos noa ))))*.