Perhaps you should try some spelling variations:
metil complex » metal complex (Expand Search), metals complex (Expand Search), met complex (Expand Search)
complex three » complex than (Expand Search), complex tones (Expand Search)
cano carlos » luciano carlos (Expand Search), bacino carlos (Expand Search), solano carlos (Expand Search)
carlos nava » carlos navarro (Expand Search), carlos eslava (Expand Search), carlos zavala (Expand Search)
combs con » combs colin (Expand Search), combs john (Expand Search), combs cody (Expand Search)
nacl cano » nacl nano (Expand Search), nacl caso4 (Expand Search), nacl cacl (Expand Search)
three na » three n (Expand Search), three near (Expand Search), three new (Expand Search)
7.5 nacl » 3.5 nacl (Expand Search), 0.9 nacl (Expand Search)
e combs » sex combs (Expand Search)
con new » icon new (Expand Search), con nee (Expand Search), con net (Expand Search)
5 metil » 5 methyl (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 e combs con new ) OR ((( 5 metil complex three na ) OR ( 7.5 nacl cano carlos nava ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j e combs con new ) or ((( 5 metil complex three na ) or ( 7.5 nacl cano carlos nava ))))*.