Perhaps you should try some spelling variations:
metil complex » metal complex (Expand Search), metals complex (Expand Search), met complex (Expand Search)
coombes john » coombs john (Expand Search), combes john (Expand Search), coombes jason (Expand Search)
complex tram » complex team (Expand Search), complex trauma (Expand Search), complex trait (Expand Search)
cano carlos » luciano carlos (Expand Search), bacino carlos (Expand Search), solano carlos (Expand Search)
carlos nav » carlos nava (Expand Search), carlos navas (Expand Search), carlos nara (Expand Search)
l coombes » k coombes (Expand Search), l coomber (Expand Search), m coombes (Expand Search)
tram ngoc » tran ngoc (Expand Search), tam ngoc (Expand Search), pham ngoc (Expand Search)
nac cano » c cano (Expand Search), ac can (Expand Search), dac can (Expand Search)
5 metil » 5 methyl (Expand Search)
7.5 nac » 7.5 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 coombes john n ) OR ((( 5 metil complex tram ngoc ) OR ( 7.5 nac cano carlos nav ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j l coombes john n ) or ((( 5 metil complex tram ngoc ) or ( 7.5 nac cano carlos nav ))))*.