Perhaps you should try some spelling variations:
metal complex » metal complexes (Expand Search)
complex mirna » complex marine (Expand Search), complex mixed (Expand Search)
comps colin » compas colin (Expand Search), combs colin (Expand Search), coros colin (Expand Search)
nina carlos » nino carlos (Expand Search), pina carlos (Expand Search), nin carlos (Expand Search)
carlos note » carlos noe (Expand Search), carlos nobre (Expand Search), carlos nojek (Expand Search)
mirna ngoc » mirna non (Expand Search)
nac nina » boc nina (Expand Search), nac mrna (Expand Search)
l comps » m comps (Expand Search)
5 metal » 5 methyl (Expand Search)
3 nac » 3 nacl (Expand Search), _ nac (Expand Search), a nac (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 comps colin a ) OR ((( 5 metal complex mirna ngoc ) OR ( 3 nac nina carlos note ))))~.
• Adding a wildcard symbol may retrieve word variants: (( j l comps colin a ) or ((( 5 metal complex mirna ngoc ) or ( 3 nac nina carlos note ))))*.